disp: msm: sde: only program LM size when needed

LM size does not need to be reprogrammed on every frame. Add
a check to only reprogram it when the size changes (or coming
out of power collapse). Some color processing features require
an update when this happens as well (i.e. resolution switch,
partial update, or dest scaler reconfigure). This patch allows
for notifying CP of the updated dimensions when a change occurs.

Change-Id: Ia7f794e53e1f03302c83e442e2a1288611c7c50b
Signed-off-by: Steve Cohen <cohens@codeaurora.org>