hwc: Invalidate on receiving PANEL_ALIVE=0 status

Invalidate on receiving PANEL_ALIVE=0 status, otherwise
during static wallpaper, panel will be reset only after
next screen update.

Change-Id: I6f5264367c8bd889b9103ed74641ac4a60538b57
CRs-Fixed: 591454
hwc: Force rotator for resolution change only if one yuv

Force rotator for resolution change only if there is one
YUV layer on primary display.

CRs-Fixed: 609450

Change-Id: I8f17de491ccfbbbfa6885eb9a35037edb2ef1b87