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

Change-Id: I1192e4c62d6da14f43cc454ce7d41c4acb58d88d