drm/msm/sde: trigger plane modeset on buffer pitch change

Need to check the buffer pitches and trigger a source rectangle
update if they change to avoid possible smmu faults.

Change-Id: I6d692e7e1d8090c8dc7a11eee7f6c3643edc71ff
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>