When there is a state change, open/close only the required channels instead of blindly closing all the channels. When HDMI is connected, open the overlay for queueing the frames on the external, and when hdmi is disconnected, only close the external overlay channel. CRs-fixed: 333324 (cherry picked from commit a6b5ac4c385e03b3c798bb07d0d3ba6140aebbe8) Change-Id: I7333a6fe106cd0aa99471542daf3c84c04c5d056
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