Add some definitions for LoongArch

Added CHAR8, CHAR16, WCHAR and VOID type definitions for LoongArch

inc/loongarch64/efibind.h

@@ -42,9 +42,10 @@ typedef int64_t             intptr_t;
 // Basic EFI types of various widths
 //
 
-#ifndef __WCHAR_TYPE__
-# define __WCHAR_TYPE__ short
-#endif
+#include <stddef.h>
+
+typedef wchar_t CHAR16;
+#define WCHAR CHAR16
 
 typedef uint64_t   UINT64;
 typedef int64_t    INT64;
@@ -54,12 +55,13 @@ typedef int32_t    INT32;
 
 typedef uint16_t   UINT16;
 typedef int16_t    INT16;
+
 typedef uint8_t    UINT8;
+typedef char       CHAR8;
 typedef int8_t     INT8;
-typedef __WCHAR_TYPE__ WCHAR;
 
 #undef VOID
-#define VOID    void
+typedef void       VOID;
 
 typedef int64_t    INTN;
 typedef uint64_t   UINTN;