x86: Define byteorder

This is required to avoid warnings like this:

In file included from <some file>:
include/io.h:7:5: warning: "__BYTE_ORDER" is not defined
include/io.h:7:21: warning: "__BIG_ENDIAN" is not defined

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/x86/include/asm/io.h

@@ -10,6 +10,8 @@
 #ifndef __ASM_X86_IO_H
 #define __ASM_X86_IO_H
 
+#include <asm/byteorder.h>
+
 static inline void outb(unsigned char value, int port)
 {
 	asm volatile("outb %b0, %w1" : : "a"(value), "Nd"(port));