drm/msm/sde: clear crtc roi if it matches full screen

Simplify tracking of the CRTC ROI when it matches full screen
mode resolution by resetting it to a null rectangle which
matches the non-partial update case handling.

Change-Id: I3446095261c4830e233d1c66a6c6caf653dba98c
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
2 files changed