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/cpu/intel/model_206ax/model_206ax.h

@@ -17,6 +17,8 @@
 #ifndef _CPU_INTEL_MODEL_206AX_H
 #define _CPU_INTEL_MODEL_206AX_H
 
+#include <stdint.h>
+
 /* SandyBridge/IvyBridge bus clock is fixed at 100MHz */
 #define SANDYBRIDGE_BCLK		100