Restore patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"

As part of bringing the master branch back in to next, we need to allow
for all of these changes to exist here.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>

include/mailbox.h

@@ -6,6 +6,8 @@
 #ifndef _MAILBOX_H
 #define _MAILBOX_H
 
+#include <linux/types.h>
+
 /**
  * A mailbox is a hardware mechanism for transferring small fixed-size messages
  * and/or notifications between the CPU on which U-Boot runs and some other