ARM: dts: add pinctrl support to Exynos5410

Add the required pin configuration support to Exynos5410 using pinctrl
interface.
ARM: odroidxu_defconfig: Hardkernel Odroid-xu board based on exynos5410
ARM: dts: Add initial device tree support for EXYNOS5410

Add initial device tree nodes for EXYNOS5410 SoC and ODROID-XU
board.