[STM32F303RE] Fix initial SP on ARM and uARM

Switch initial stack pointer from 0x2000 4000 to 0x2001 0000 (top of ram)

Author: svastm

hal/targets/cmsis/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F303RE/TOOLCHAIN_ARM_MICRO/startup_stm32f303xe.S

@@ -51,7 +51,7 @@ Stack_Size      EQU     0x00000400
                 EXPORT  __initial_sp
                 
 Stack_Mem       SPACE   Stack_Size
-__initial_sp    EQU     0x20004000 ; Top of RAM
+__initial_sp    EQU     0x20010000 ; Top of RAM
 
 
 ; <h> Heap Configuration

hal/targets/cmsis/TARGET_STM/TARGET_STM32F3/TARGET_NUCLEO_F303RE/TOOLCHAIN_ARM_STD/startup_stm32f303xe.S

@@ -39,7 +39,7 @@
 ;
 ;*******************************************************************************
 
-__initial_sp    EQU     0x20004000 ; Top of RAM
+__initial_sp    EQU     0x20010000 ; Top of RAM
 
                 PRESERVE8
                 THUMB