tools/loongarch: Use __SIZEOF_LONG__ to define __BITS_PER_LONG

Although __SIZEOF_POINTER__ is equal to _SIZEOF_LONG__ on LoongArch,
it is better to use __SIZEOF_LONG__ to define __BITS_PER_LONG to keep
consistent between arch/loongarch/include/uapi/asm/bitsperlong.h and
tools/arch/loongarch/include/uapi/asm/bitsperlong.h.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

tools/arch/loongarch/include/uapi/asm/bitsperlong.h

@@ -2,7 +2,7 @@
 #ifndef __ASM_LOONGARCH_BITSPERLONG_H
 #define __ASM_LOONGARCH_BITSPERLONG_H
 
-#define __BITS_PER_LONG (__SIZEOF_POINTER__ * 8)
+#define __BITS_PER_LONG (__SIZEOF_LONG__ * 8)
 
 #include <asm-generic/bitsperlong.h>