STM32F412 IAR linker file issue

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F412xG/device/TOOLCHAIN_IAR/stm32f412xx.icf

@@ -10,7 +10,7 @@ define symbol __region_ROM_end__   = MBED_APP_START + MBED_APP_SIZE;
 define symbol __NVIC_start__          = 0x20000000;
 define symbol __NVIC_end__            = 0x200001C7; /* Aligned on 8 bytes */
 define symbol __region_RAM_start__    = 0x200001C8;
-define symbol __region_RAM_end__      = 0x2001FFFF;
+define symbol __region_RAM_end__      = 0x2003FFFF;
 
 /* Memory regions */
 define memory mem with size = 4G;