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/include/swab.h

@@ -1,6 +1,3 @@
-#ifndef _SWAB_H
-#define _SWAB_H
-
 /*
  * linux/byteorder/swab.h
  * Byte-swapping, independently from CPU endianness
@@ -18,6 +15,12 @@
 /* casts are necessary for constants, because we never know how for sure
  * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
  */
+
+#ifndef _SWAB_H
+#define _SWAB_H
+
+#include <stdint.h>
+
 #define swab16(x) \
 	((unsigned short)( \
 		(((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \