ARM: exynos5410: add dt support for gsc

This patch adds G-sclater devices to the DT device list.
clk: exynos5410: modify clocks for hdmi
Revert "drm/exynos: hdmi: Disable HPD support"

This reverts commit 30080b00b4faf8e5c3ed36d5fb4ef6fbc4f4e4cb.