Fix ISR stack size inconsistencies on NRF52 series

GCC and IAR ISR stack sizes have been set to 0x800.
(ARM compiler does not set stack size explicitly).

Author: Marcus Chang

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/device/TOOLCHAIN_GCC_ARM/NRF52832.ld

@@ -223,8 +223,8 @@ SECTIONS
         *(.heap*);
 
         /* Expand the heap to reach the stack boundary. */
-        ASSERT(. <= (ORIGIN(RAM) + LENGTH(RAM) - 0x8000), "heap region overflowed into stack");
-        . += (ORIGIN(RAM) + LENGTH(RAM) - 0x8000) - .;
+        ASSERT(. <= (ORIGIN(RAM) + LENGTH(RAM) - 0x800), "heap region overflowed into stack");
+        . += (ORIGIN(RAM) + LENGTH(RAM) - 0x800) - .;
     } > RAM
     PROVIDE(__heap_start = ADDR(.heap));
     PROVIDE(__heap_size = SIZEOF(.heap));

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/device/TOOLCHAIN_IAR/nRF52832.icf

@@ -40,8 +40,8 @@ export symbol __ICFEDIT_region_RAM_end__;
 
 /*-Sizes-*/
 /*Heap 1/4 of ram and stack 1/8*/
-define symbol __ICFEDIT_size_cstack__   = 0x2000;
-define symbol __ICFEDIT_size_heap__     = 0x4000;
+define symbol __ICFEDIT_size_cstack__   = 0x800;
+define symbol __ICFEDIT_size_heap__     = 0x5800;
 /**** End of ICF editor section. ###ICF###*/
 
 define symbol __code_start_soft_device__ = 0x0;

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_IAR/nRF52840.icf

@@ -40,8 +40,8 @@ export symbol __ICFEDIT_region_RAM_end__;
 
 /*-Sizes-*/
 /*Heap 1/4 of ram and stack 1/8*/
-define symbol __ICFEDIT_size_cstack__   = 0x8000;
-define symbol __ICFEDIT_size_heap__     = 0x10000;
+define symbol __ICFEDIT_size_cstack__   = 0x800;
+define symbol __ICFEDIT_size_heap__     = 0x17800;
 /**** End of ICF editor section. ###ICF###*/
 
 define symbol __code_start_soft_device__ = 0x0;