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/soc/intel/quark/include/soc/i2c.h

@@ -16,6 +16,8 @@
 #ifndef _QUARK_I2C_H_
 #define _QUARK_I2C_H_
 
+#include <stdint.h>
+
 typedef volatile struct _I2C_REGS {
 	volatile uint32_t ic_con;  /* 00: Control Register */
 	volatile uint32_t ic_tar;  /* 04: Master Target Address */