Remove duplicate defines for ARRAY_SIZE

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/include/common.h b/include/common.h
index c4ee3e2..75fb676 100644
--- a/include/common.h
+++ b/include/common.h
@@ -665,4 +665,6 @@
 #error Read section CONFIG_SKIP_LOWLEVEL_INIT in README.
 #endif
 
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
 #endif	/* __COMMON_H_ */