video: rockchip: hdmi: support modify color mode and depth simultaneously

video: rockchip: hdmi: support modify color mode and depth simultaneously

Use following command:

echo mode=<value> > /sys/class/display/HDMI/mode

<value> is decimal digits, lower 8bit is color mode, upper 8bit is depth.
For example:
	value = 131 = 0x83 means YCbCr444 8bit output
	value = 164 = 0xa4 means YCbCr422 10bit output
	value = 0 means restore auto mode(8bit, priority YCbCr444)

Change-Id: I256906d91f7075defb4d785cfc15926ca5627093
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
(cherry picked from commit c3620a88e55c3ade4a823adea08b0bb2acc4737e)