sb/intel/i82801jx/nvs.h: include required header

u8, u16, ... are defined in stdint.h.

Change-Id: I045438a7e754d4da936cf2ded411d055f2f69b45
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36556
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/southbridge/intel/i82801jx/nvs.h

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