util: Use common ARRAY_SIZE define

Remove duplicated definitions of ARRAY_SIZE macro across util/ dir.
Instead of duplicates, use the one from commonlib/bsd/helpers.h file.

BUG=b:231765496
TEST=make -C util/cbfstool; make -C util/cbmem;
     make -C util/intelmetool; make -C util/superiotool

Change-Id: I29b776586b4f0548d4026b2ac77095791fc9f3a3
Signed-off-by: Konrad Adamczyk <konrada@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74474
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
Reviewed-by: Grzegorz Bernacki
Reviewed-by: Robert Zieba <robertzieba@google.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/cbfstool/flashmap/fmap.c

@@ -14,13 +14,12 @@
 #include <limits.h>
 #include <assert.h>
 #include <commonlib/bsd/sysincludes.h>
+#include <commonlib/bsd/helpers.h>
 
 #include "fmap.h"
 #include "kv_pair.h"
 #include "valstr.h"
 
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
 const struct valstr flag_lut[] = {
 	{ FMAP_AREA_STATIC, "static" },
 	{ FMAP_AREA_COMPRESSED, "compressed" },