Enable HDMI by default on the devkit

Once we've fixed up the userspace bits we can turn that on by default.

added devkit label

@martin.kepplinger i think we can flip that on, do you want to give it a try?

I want to. :) Can't say when though but hope to be able to rebase next week, and to do this change against next.

no urgency - it's better after the next phosh release anyway.

mentioned in merge request !227 (closed)

done in version 5.9.0+librem5.1 of linux-next-librem5

closed