Fix linker script for NRF52840/IAR

Add missing noinit section.

Author: Marcus Chang

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

@@ -55,7 +55,7 @@ define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 initialize by copy { readwrite };
 do not initialize  { section .noinit };
-place at address mem:__ICFEDIT_region_RAM_NVIC_start__ { section .noinit };
+place in RAM_region { section .noinit };
 
 keep { section .intvec };
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };

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

@@ -54,8 +54,11 @@ define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
 define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };
 
 initialize by copy { readwrite };
+do not initialize  { section .nvictable };
+place at address mem:__ICFEDIT_region_RAM_NVIC_start__ { section .nvictable };
+
 do not initialize  { section .noinit };
-place at address mem:__ICFEDIT_region_RAM_NVIC_start__ { section .noinit };
+place in RAM_region { section .noinit };
 
 keep { section .intvec };
 place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };