[Realtek][RTL8721CSM]  arch/arm/src/amebad/ : Fix MSP and idle stack not matched issue.
Fix MSP and idle stack not matched issue. 1st commit for define g_idle_topstack to MSP which the bootloader set for main stack.
#include "nvic.h"
#endif
-const uintptr_t g_idle_topstack = (uintptr_t)&_ebss + CONFIG_IDLETHREAD_STACKSIZE;
+#define MSP_RAM_HP_NS 0x10004FFC
+const uintptr_t g_idle_topstack = MSP_RAM_HP_NS;
/****************************************************************************
* Name: _start
