drm/msm/dp: set pixel_encoding and colorimetry info

Configure MISC0 register to indicate correct Pixel_Encoding
and Colorimetry information as per output color formats.

Change-Id: I9b9719187ad899250e69ad1b219117fc1f037ab8
Signed-off-by: Ramendra Kumar <ramendra@codeaurora.org>
Signed-off-by: Narender Ankam <nankam@codeaurora.org>