mxc: gpu_viv: Fix event interrupt evalution

Fix the mask to check for an MMU exception, as well as changing
the pending == 0 test to be after we have masked off possible
errors.
dts: microsom-ar8035: MDIO pad must be set open drain

MDIO pad must be set open drain.

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>