[M487] Fix include file error in case-sensitive environment

Author: ccli8

targets/TARGET_NUVOTON/TARGET_M480/device/StdDriver/m480_sdh.c

@@ -11,7 +11,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "m480.h"
+#include "M480.h"
 
 /** @addtogroup M480_Device_Driver M480 Device Driver
   @{