[cortex-m] Remove unused process stack pointer

Author: salkinium

src/modm/platform/core/cortex/vectors.c.in

@@ -31,7 +31,6 @@ typedef void (* const FunctionPointer)(void);
 
 // defined in the linkerscript
 extern uint32_t __main_stack_top[];
-extern uint32_t __process_stack_top[];
 
 // Define the vector table
 modm_section(".vector_rom")

src/modm/platform/core/sam/module.md

@@ -25,7 +25,6 @@ Currently only one basic linkerscript is supported.
             │  .data                 │
             │  .fastdata             │
             │  .fastcode             │
-            │  +PROCESS_STACK_SIZE   │◄ __process_stack_top
     RAM     │  +MAIN_STACK_SIZE      │◄ __main_stack_top
 0x2000 0000 └────────────────────────┘◄ __ram_start
 

src/modm/platform/core/stm32/module.md

@@ -66,7 +66,6 @@ SRAMs explicitly to free up the space in the lower sections.
             │  .fastdata             │
             │  .fastcode             │
             │ (.vector_ram)          │◄ only if remapped into RAM
-            │  +PROCESS_STACK_SIZE   │◄ __process_stack_top
    SRAM1    │  +MAIN_STACK_SIZE      │◄ __main_stack_top
 0x2000 0000 └────────────────────────┘◄ __sram1_start
 
@@ -135,7 +134,6 @@ Therefore the main stack is placed into SRAM, even though it is slower than CCM.
             │  .data                 │
             │  .fastcode             │
             │ (.vector_ram)          │◄ only if remapped into RAM
-            │  +PROCESS_STACK_SIZE   │◄ __process_stack_top
    SRAM1    │  +MAIN_STACK_SIZE      │◄ __main_stack_top
 0x2000 0000 └────────────────────────┘◄ __sram1_start
 
@@ -205,7 +203,6 @@ not DMA-able.
             │  .bss                  │
             │  .data_sram1           │
             │  .data                 │
-            │  +PROCESS_STACK_SIZE   │◄ __process_stack_top
    SRAM1    │  +MAIN_STACK_SIZE      │◄ __main_stack_top
 0x2000 0000 └────────────────────────┘◄ __sram1_start
 
@@ -285,7 +282,6 @@ overflow into the SRAM1/2 sections.
    access   │  .data_dtcm            │
             │  .data                 │
             │  .fastdata             │
-            │  +PROCESS_STACK_SIZE   │◄ __process_stack_top
     DTCM    │  +MAIN_STACK_SIZE      │◄ __main_stack_top
 0x2000 0000 └────────────────────────┘◄ __dtcm_start
 
@@ -391,7 +387,6 @@ placed into the 128kB DTCM, but cannot overflow into D1_SRAM section.
     only    │  .data_dtcm            │
    access   │  .data                 │
             │  .fastdata             │
-            │  +PROCESS_STACK_SIZE   │◄ __process_stack_top
     DTCM    │  +MAIN_STACK_SIZE      │◄ __main_stack_top
 0x2000 0000 └────────────────────────┘◄ __dtcm_start