msm: mdss: do not skip pipe programming if roi changed

Current driver has an optimization where if pipe parameters are not
changed between consecutive updates then it will skip pipe's HW register
programming. However when partial update is enabled and ROI is changed
compared to previous update, pipe's HW programming should not be skipped
because HW is programmed with stale ROI for that given pipe. Fix this by
forcing pipe HW programming update if ROI is changed.

Change-Id: Iebff043ecbb35b22ffbe344bdffa830602437252
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>
Signed-off-by: Divya Sharma <c_shard@codeaurora.org>