drm/msm/sde: fix csc and qseed prop config

csc and qseed properties are defined optional
and should be treated as optional property. This
patch fixes the invalid error code return and
provide correct property information to client.

Change-Id: Idfe750d3afbd0d88d89ffa873deae130a24b2827
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>