arm:exynos4:pinmux: Modify the gpio function for mmc

This patch add pinmux settings for Exynos4 for mmc0 and mmc2

Signed-off-by: Piotr Wilczek <p.wilczek@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>