[M2351] Fix include file name error on case-sensitive system

Author: ccli8

targets/TARGET_NUVOTON/TARGET_M2351/pinmap.c

@@ -19,7 +19,7 @@
 #include "pinmap.h"
 #include "PortNames.h"
 #include "mbed_error.h"
-#include "partition_m2351.h"
+#include "partition_M2351.h"
 
 /**
  * Configure pin multi-function