Dynamic heap support will be breaking change for all targets in IAR 7.x

Reverting this feature till IAR 8.x is stable and supported in Mbed OS
for few releases

1. Revert "Add Dynamic heap support to IAR"

This reverts commit 8ee29bb.

2. Revert "Splited RAM section not compatible with dynamic HEAP."

This reverts commit a645bb2.

3. Revert "Add Dynamic heap support to IAR"

This reverts commit 891e1f2.

Author: Deepika

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M0/device/TOOLCHAIN_IAR/MPS2.icf

@@ -63,7 +63,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M0P/device/TOOLCHAIN_IAR/MPS2.icf

@@ -63,7 +63,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M3/device/TOOLCHAIN_IAR/MPS2.icf

@@ -63,7 +63,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M4/device/TOOLCHAIN_IAR/MPS2.icf

@@ -63,7 +63,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_ARM_FM/TARGET_FVP_MPS2/TARGET_FVP_MPS2_M7/device/TOOLCHAIN_IAR/MPS2.icf

@@ -63,7 +63,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_ARM_SSG/TARGET_BEETLE/device/TOOLCHAIN_IAR/BEETLE.icf

@@ -47,7 +47,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_ARM_SSG/TARGET_CM3DS_MPS2/device/TOOLCHAIN_IAR/MPS2.icf

@@ -71,7 +71,7 @@ initialize by copy { readwrite };
 do not initialize  { section .noinit };
 
 define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
-define block HEAP      with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8     { };
+define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };
 place in ROM_region   { readonly };

targets/TARGET_Analog_Devices/TARGET_ADUCM302X/TARGET_ADUCM3029/TOOLCHAIN_IAR/ADuCM3029.icf

@@ -54,8 +54,7 @@ define region RAM_bank1_region            = mem:[from 0x20000200 size 0x00003E00
 define region RAM_bank2_region            = mem:[from 0x20004000 size 0x00004000]
                                           | mem:[from 0x20040000 size 0x00007000];
 define block CSTACK   with alignment = 16, size = MBED_BOOT_STACK_SIZE { };
-define block HEAP     with expanding size, minimum size = 0x2000, alignment = 16 { };
-
+define block HEAP     with alignment = 16, size = 0x2000 { };
 do not initialize                         { section .noinit };
 initialize by copy                        { rw };
 place at start of ROM_PAGE0_INTVEC        { ro section .vectors };

targets/TARGET_Analog_Devices/TARGET_ADUCM4X50/TARGET_ADUCM4050/TOOLCHAIN_IAR/ADuCM4050.icf

@@ -53,10 +53,8 @@ define region ROM_REGION                  = mem:[from MBED_APP_START+ADUCM_SECTO
 define region RAM_bank1_region            = mem:[from 0x20040000 size 0x00008000];
 define region RAM_bank2_region            = mem:[from 0x20000200 size 0x00006E00]
                                           | mem:[from 0x20048000 size 0x00010000];
-
 define block CSTACK   with alignment = 16, size = MBED_BOOT_STACK_SIZE { };
-define block HEAP     with expanding size, minimum size = 0x6000, alignment = 16 { };
-
+define block HEAP     with alignment = 16, size = 0x6000 { };
 do not initialize                         { section .noinit };
 initialize by copy                        { rw };
 place at start of ROM_PAGE0_INTVEC        { ro section .vectors  };

targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/TARGET_CY8C63XX/TARGET_MCU_PSOC6_M0/device/TOOLCHAIN_IAR/cy8c6xx7_cm0plus.icf

@@ -148,7 +148,7 @@ define region IRAM1_region = mem:[from __ICFEDIT_region_IRAM1_start__ to __ICFED
 
 define block CSTACK     with alignment = 8, size = __ICFEDIT_size_cstack__     { };
 define block PROC_STACK with alignment = 8, size = __ICFEDIT_size_proc_stack__ { };
-define block HEAP       with expanding size, minimum size = __ICFEDIT_size_heap__, alignment = 8 { };
+define block HEAP       with alignment = 8, size = __ICFEDIT_size_heap__       { };
 define block HSTACK {block HEAP, block PROC_STACK, last block CSTACK};
 define block RO     {first section .intvec, readonly};