Merge pull request #12496 from amq/efm32_fix_pinmap_test

EFM32: fix mbed_hal-pinmap test

Author: 0xc0170

targets/TARGET_Silicon_Labs/TARGET_EFM32/common/CommonPinNames.h

@@ -41,7 +41,7 @@
     PI0 =  8 << 4, PI1, PI2, PI3, PI4, PI5, PI6, PI7, PI8, PI9, PI10, PI11, PI12, PI13, PI14, PI15, \
     PJ0 =  9 << 4, PJ1, PJ2, PJ3, PJ4, PJ5, PJ6, PJ7, PJ8, PJ9, PJ10, PJ11, PJ12, PJ13, PJ14, PJ15, \
     PK0 = 10 << 4, PK1, PK2, PK3, PK4, PK5, PK6, PK7, PK8, PK9, PK10, PK11, PK12, PK13, PK14, PK15, \
-    NC = (unsigned int) 0xFFFFFFFFUL
+    NC = (int) 0xFFFFFFFF
 
 #ifdef __cplusplus
 extern "C" {