[M2351] Adding missing ENDP for ARM

Author: Deepika

targets/TARGET_NUVOTON/TARGET_M2351/device/M2351_funcs.S

@@ -24,7 +24,8 @@ __PC
 
 
 #if defined(__CC_ARM)  || (defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))
-    ALIGN    
+    ALIGN
+    ENDP
     END
 #elif defined(__GNUC__)                
     .align