Merge "Camera: Clarify CAMERA_OPEN_CLOSE_LISTENER description" into qt-qpr1-dev am: 6b541cb6e0 am: 6a17f845fa am: 31bf712be0 am: 887aa9ac1a am: b8d5db3f7b

Change-Id: I3595eb67ddbc11b06123ca1ba97e3d31cc20da3d