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/u-boot/sha256.h

@@ -1,6 +1,8 @@
 #ifndef _SHA256_H
 #define _SHA256_H
 
+#include <linux/types.h>
+
 #define SHA256_SUM_LEN	32
 #define SHA256_DER_LEN	19