util/cbfstool: Include commonlib/helpers.h in common.h

This avoids re-declaring common macros like ARRAY_SIZE, MIN, MAX and
ALIGN. Also removes the issues around including both files in any
tool.

Also, fix comparison error in various files by replacing int with
size_t.

Change-Id: I06c763e5dd1bec97e8335499468bbdb016eb28e5
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/14978
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/util/cbfstool/common.h b/util/cbfstool/common.h
index ea6f3cf..d4b7021 100644
--- a/util/cbfstool/common.h
+++ b/util/cbfstool/common.h
@@ -22,17 +22,12 @@
 #include <string.h>
 #include <assert.h>
 
+#include <commonlib/helpers.h>
 #include <console/console.h>
 
 /* Endianess */
 #include "swab.h"
 
-/* Helpers */
-#define ARRAY_SIZE(a) (int)(sizeof(a) / sizeof((a)[0]))
-#define ALIGN(val, by) (((val) + (by)-1)&~((by)-1))
-#define MAX(x, y) ((x) > (y) ? (x) : (y))
-#define MIN(x, y) ((x) < (y) ? (x) : (y))
-
 #define IS_TOP_ALIGNED_ADDRESS(x)	((uint32_t)(x) > 0x80000000)
 
 #define unused __attribute__((unused))