mdio.h: Include linux/types.h

Fixes:

/home/davem/src/GIT/net-next/usr/include/linux/mdio.h:271: found __[us]{8,16,32,64} type without #include <linux/types.h>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/mdio.h

@@ -10,6 +10,7 @@
 #ifndef __LINUX_MDIO_H__
 #define __LINUX_MDIO_H__
 
+#include <linux/types.h>
 #include <linux/mii.h>
 
 /* MDIO Manageable Devices (MMDs). */