sb/i82801gx/nvs: Add missing <stdint.h>

Change-Id: I22b3fb31d8694c76b4a6fdfa40a72977e9099815
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37899
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/i82801gx/nvs.h

@@ -13,6 +13,8 @@
  * GNU General Public License for more details.
  */
 
+#include <stdint.h>
+
 typedef struct {
 	/* Miscellaneous */
 	u16	osys; /* 0x00 - Operating System */