[Nuvoton] Force enum PinName to 32-bit

NU_PINNAME_BIND(...) requires enum PinName to be 32-bit to encode module
binding information in it.

Author: ccli8

targets/TARGET_NUVOTON/TARGET_M2351/PinNames.h

@@ -173,6 +173,9 @@ typedef enum {
     BUTTON1 = SW2,
     BUTTON2 = SW3,
 
+    // Force PinName to 32-bit required by NU_PINNAME_BIND(...)
+    FORCE_ENUM_PINNAME_32BIT = 0x7FFFFFFF,
+
 } PinName;
 
 #ifdef __cplusplus

targets/TARGET_NUVOTON/TARGET_M451/PinNames.h

@@ -134,6 +134,9 @@ typedef enum {
     BUTTON1 = SW2,
     BUTTON2 = SW3,
 
+    // Force PinName to 32-bit required by NU_PINNAME_BIND(...)
+    FORCE_ENUM_PINNAME_32BIT = 0x7FFFFFFF,
+
 } PinName;
 
 #ifdef __cplusplus

targets/TARGET_NUVOTON/TARGET_M480/PinNames.h

@@ -139,6 +139,9 @@ typedef enum {
     BUTTON1 = SW2,
     BUTTON2 = SW3,
 
+    // Force PinName to 32-bit required by NU_PINNAME_BIND(...)
+    FORCE_ENUM_PINNAME_32BIT = 0x7FFFFFFF,
+
 } PinName;
 
 #ifdef __cplusplus

targets/TARGET_NUVOTON/TARGET_NANO100/PinNames.h

@@ -131,6 +131,9 @@ typedef enum {
     BUTTON1 = SW1,
     BUTTON2 = SW2,
 
+    // Force PinName to 32-bit required by NU_PINNAME_BIND(...)
+    FORCE_ENUM_PINNAME_32BIT = 0x7FFFFFFF,
+
 } PinName;
 
 #ifdef __cplusplus

targets/TARGET_NUVOTON/TARGET_NUC472/PinNames.h

@@ -137,6 +137,9 @@ typedef enum {
     BUTTON1 = SW1,
     BUTTON2 = SW2,
 
+    // Force PinName to 32-bit required by NU_PINNAME_BIND(...)
+    FORCE_ENUM_PINNAME_32BIT = 0x7FFFFFFF,
+
 } PinName;
 
 #ifdef __cplusplus