video: support MIPI-DSI controller driver

Hi,

Samsung S5PC210 and EXYNOS SoC platform has MIPI-DSI controller and LCD panel based on MIPI-DSI could be used with it.

This patch set includes MIPI-DSI master driver and MIPI-DSI slave amoled panel driver.

It consists of the flowing patches.

[PATCH v5 1/2]video: support MIPI-DSI controller driver
[PATCH v5 2/2]video: backlight: support s6e8ax0 panel driver based on MIPI DSI

Changes since v4:
- include s6e8ax0 amoled panel driver based on MIPI DSI
- remove compile warnings and useless code

Best regards,
Donghwa LEE