pinctrl/nomadik: add pin group to mco function

mc0_dat47_a_1 and mc0dat31dir_a_1 groups are missing for mco function

Signed-off-by: Patrice Chotard <patrice.chotard@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>