drm/edid: add colorimetry block parsing support

Parse the colorimetry data block of EDID to get
information about the supported encoding formats
of the sink.

This information is needed to use the appropriate
color encoding scheme before transmitting the video
stream to the sink.

Change-Id: I133e8f21fa4ad843219dbefed2d072ad2edab197
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>
Signed-off-by: Chirag Khurana <ckhurana@codeaurora.org>