scripts/kallsyms: remove unneeded #ifndef ARRAY_SIZE

This is not defined in the standard headers. #ifndef is unneeded.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

scripts/kallsyms.c

@@ -24,9 +24,7 @@
 #include <ctype.h>
 #include <limits.h>
 
-#ifndef ARRAY_SIZE
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
-#endif
 
 #define KSYM_NAME_LEN		128