ARM: 7831/1: mmc: mmci: Adapt to new pinctrl handling

There is no need for every driver to fetch a pinctrl handle and to
select the default state. Instead this is handled by the device driver
core, thus we can remove this piece of code from mmci.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>