hwc: Listen fb0 event for panel status

Listen fb0 status change event for panel status. fb0 will receive
"PANEL_ALIVE=0" when panel is not responding to status call.
Call blank and unblank to reset the panel in next hwc_prepare
call.

Change-Id: I941a501a82d9f3b725660ad09631c1d8602b7325
3 files changed