[mbed][MTS_DRAGONFLY_F411RE] update stack and heap size for Dragonfly in IAR

Author: mfiore02

libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F4/TARGET_MTS_DRAGONFLY_F411RE/TOOLCHAIN_IAR/stm32f411xe.icf

@@ -15,10 +15,10 @@ define region ROM_region = mem:[from __region_ROM_start__ to __region_ROM_end__]
 define region RAM_region = mem:[from __region_RAM_start__ to __region_RAM_end__];
 
 /* Stack and Heap */
-/* Stack: 32kB - 408B for vector table */
-/* Heap: 80kB */
-define symbol __size_cstack__ = 0x7e68;
-define symbol __size_heap__   = 0x14000;
+/* Stack: 4kB - 408B for vector table */
+/* Heap: 96kB */
+define symbol __size_cstack__ = 0xe68;
+define symbol __size_heap__   = 0x18000;
 define block CSTACK    with alignment = 8, size = __size_cstack__   { };
 define block HEAP      with alignment = 8, size = __size_heap__     { };
 define block STACKHEAP with fixed order { block HEAP, block CSTACK };