Currently stable/11 is using custom DTS for beaglebone(-black) while CURRENT
is using the upstream ones from Linux.
U-Boot ports have been changed to use the upstream names so 11.1-PRERELEASE
doesn't boot.
Since we cannot MFC the DTS easily (a lot of drivers would have to be modified)
add links on the dts with upstream names.

This is a direct commit to stable/11

Approved by: re (marius)