EXYNOS: support display drivers

This patch support EXYNOS display drivers including Framebuffer and MIPI DSI interface.

[PATCH 1/7] EXYNOS: definitions of system resgister and power management registers. [PATCH 2/7] EXYNOS: add LCD and MIPI DSI clock interface.
[PATCH 3/7] LCD: add data structure for EXYNOS display driver
[PATCH 4/7] EXYNOS: support EXYNOS framebuffer and FIMD display drivers. [PATCH 5/7] EXYNOS: support EXYNOS MIPI DSI interface driver.
[PATCH 6/7] LCD: support S6E8AX0 amoled driver based on EXYNOS MIPI DSI. [PATCH 7/7] EXYNOS: support TRATS board display function

Thank you,
Donghwa Lee