p990: don't use my dev repos

@metaiiica pointed the device tree to my dev repos (13290c7 and
9b855e4).
Do not use them, please - they're tagged as dev for a reason.
I'm experimenting there, they can (and will) break builds.

I'm maintaining clean repos at @p990-dev - just use them.

Signed-off-by: tonyp <tonyptonyp@gmail.com>