src: Add missing include <stdint.h>

Change-Id: Idf10a09745756887a517da4c26db7a90a1bf9543
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29403
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/drivers/net/chip.h

@@ -14,6 +14,8 @@
 #ifndef __DRIVERS_R8168_CHIP_H__
 #define __DRIVERS_R8168_CHIP_H__
 
+#include <stdint.h>
+
 struct drivers_net_config {
 	uint16_t customized_leds;
 	unsigned wake;	/* Wake pin for ACPI _PRW */