pinctrl: mvebu: Make drivers depend on the pinctrl framework

Armada pinctrl drivers shall not be compiled without the entire pinctrl
framework and thus lack a "depends on" condition, otherwise the driver
will simply not be probed.

Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Stefan Roese <sr@denx.de>