[ARM] pxa: Fix Colibri AX88796 configuration

Broaden the AX88796 register mask to allow access to the reset register.
Remove unnecessary value definitions and the second resource block.

Diagnosed-by: Matthias Meier <matthias.j.meier@gmx.net>
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Eric Miao <eric.miao@marvell.com>