pinctrl: exynos: add exynos5250 SoC specific data

Add Samsung Exynos5250 SoC specific data to enable pinctrl support for
all platforms based on Exynos5250.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>