drm: msm: remove YUV format setting

Remove the YUV format setting, will use the upstream code
for YUV mode check.

Change-Id: I24f059ff7cd4cf64f41d7f77bfa6517df0cccfde
Signed-off-by: Zhao, Yuan <yzhao@codeaurora.org>
Signed-off-by: Soutrik Mukhopadhyay <quic_mukhopad@quicinc.com>