Camera2: fix flashlight widget status error after luanch camera

Flashlight will be initialized when we luanch camera.But flashlight
widget do not know the flashlight has been turned off.So the widget's
status still in turn-on.

Send a broadcast to make flashlight widget know that flashlight has
been closed.So the status can be right.

CRs-Fixed: 670735

Change-Id: I8a6b7f49111071f23bc55c6d61b01a38d807cb57
1 file changed