Fix the broken build for Marvell Dove platform.

Remove call to the old GPIO init function.
Fix old MPP control offset value.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Acked-by: Saeed Bishara <saeed.bishara@gmail.com>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>