Decrease NUC472 interrupt stack size

Decrease the interrupt stack of the NUC472 from 12KB to 8KB. This
frees up enough space to allow the core tests to run.

Author: c1728p9

hal/targets/cmsis/TARGET_NUVOTON/TARGET_NUC472/TARGET_NUMAKER_PFM_NUC472/TOOLCHAIN_IAR/NUC472_442.icf

@@ -11,7 +11,7 @@ define symbol __ICFEDIT_region_IRAM_end__   = 0x20010000;
 define symbol __ICFEDIT_region_XRAM_start__ = 0x60000000;
 define symbol __ICFEDIT_region_XRAM_end__   = 0x60100000;
 /*-Sizes-*/
-define symbol __ICFEDIT_size_cstack__ = 0x3000;
+define symbol __ICFEDIT_size_cstack__ = 0x2000;
 define symbol __ICFEDIT_size_heap__   = 0xC0000;
 /**** End of ICF editor section. ###ICF###*/