ARM: dts: add initial dts file for EXYNOS5440, SSDK5440

This patch adds initial dts file for EXYNOS5440 SoC and adds the
dts file for SSDK5440 board which is a kind of reference board.
More properties will be added later.

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
3 files changed