hwc: Set external display indicator on RESUME event

   Treat RESUME event as ONLINE event. On Resume event, set
   external display indicator. This will ensure that GPU
   will be used for Primary composition there by freeing
   remaining pipes ensuring that External will be assured
   of pipe allocation.

Change-Id: I53471f4f828811ed8645cf8b08beaab7b46d181d
1 file changed