move ARRAY_SIZE() definition to utils.h
diff --git a/firmware/src_simtrace/iso7816_fidi.c b/firmware/src_simtrace/iso7816_fidi.c
index 052654c..b35f068 100644
--- a/firmware/src_simtrace/iso7816_fidi.c
+++ b/firmware/src_simtrace/iso7816_fidi.c
@@ -20,10 +20,9 @@
#include <stdint.h>
#include <errno.h>
+#include "utils.h"
#include "iso7816_fidi.h"
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
/* Table 7 of ISO 7816-3:2006 */
static const uint16_t fi_table[] = {
372, 372, 558, 744, 1116, 1488, 1860, 0,