src: Add missing include <stdint.h>

Change-Id: I6a9d71e69ed9230b92f0f330875515a5df29fc06
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29312
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/harcuvar/spd/spd.h

@@ -18,6 +18,8 @@
 #ifndef MAINBOARD_SPD_H
 #define MAINBOARD_SPD_H
 
+#include <stdint.h>
+
 #define SPD_LEN 512
 
 #define SPD_DRAM_TYPE 2