ARM: EXYNOS: Change the base address values for zreladdr-y,params_phys-y
from 40000000 to 20000000

This patch is temporarily to boot.
i2c: exynos5: Clock_disable_unprepare comment temporarily
ARM: dts: Add Initial device tree support for odroidxu2

Add initial device tree for odroidxu2
ARM: Add Kconfig to 12 of NR_BANKS for EXYNOS5420
ARM: odroidxu2_defconfig: odroidxu2 board based on exynos5420