Moves the properties of DP controller to exynos5.dtsi which are common
across exynos5 SoCs like Exynos5250 and Exynos5420.

The PHY DP Node is based on Jingoo Han's <jg1.han@samsung.com> patch
at https://patchwork.linuxtv.org/patch/19189/Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>