Fix missing inttypes define on ARM

BUG=none
TEST=emerge-tegra2_seaboard vboot_reference-firmware

Change-Id: Ia14468885454383945dd47d328a54c7f6b7221e0
Reviewed-on: http://gerrit.chromium.org/gerrit/4667
Tested-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Elly Jones <ellyjones@chromium.org>

firmware/arch/arm/include/biosincludes.h

@@ -21,6 +21,7 @@ typedef unsigned int size_t;
 
 #define UINT32_C(x) ((uint32_t) x)
 #define UINT64_C(x) ((uint64_t) x)
+#define PRIu32 "u"
 #define PRIu64 "llu"
 extern void debug(const char *format, ...);