drm/exynos: Implement dpms display callback in DP

This patch implements the dpms display callback for the DP driver.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --cc drivers/gpu/drm/exynos/exynos_dp_core.c
Simple merge

diff --cc drivers/gpu/drm/exynos/exynos_dp_core.h
Simple merge