disp: msm: sde: avoid plane update if crtc inactive

This change passes DRM_PLANE_COMMIT_ACTIVE_ONLY during
drm_atomic_helper_commit_planes in complete commit. Passing
this flag insures that if crtc is inactive, plane update
will not be made. This avoids trying to commit a plane
while entering low power mode when crtc and encoder are
already disabled.

Change-Id: Ic08a4f42cf832709332ccbf4a9df39342f858eec
Signed-off-by: Samantha Tran <samtran@codeaurora.org>