include: Add missing headers in a few instances

A few headers rely on indirect inclusion of <linux/types.h> or
<linux/kernel.h> so add them directly. In the case of <netdev.h> add a
"struct bd_info;" as well rather than the large header chain to resolve
that.

Signed-off-by: Tom Rini <trini@konsulko.com>

include/phy_interface.h

@@ -11,6 +11,7 @@
 #define _PHY_INTERFACE_H
 
 #include <string.h>
+#include <linux/kernel.h>
 
 typedef enum {
 	PHY_INTERFACE_MODE_NA, /* don't touch */