p990: don't use my dev repos

@metaiica pointed the device tree to my repos (13290c72 and 9b855e4f)
Do not use my dev repos for your builds, please.
They're tagged as dev for a reason, they can (and will) break builds,
I'm experimenting there.
I'm maintaining clean repos at @p990-dev - just use them.

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