Stop Kamera KCM holding the camera device
Kamera did not properly close and delete the camera devices abstractions, which is the caused of 487824. This is fixed in this MR.
However, with the current implementation, the camera device will be held by Kamera KCM as long as it is running and other applications cannot access the camera device while Kamera KCM is open. We could call gp_camera_exit
after every operation, but then camera access takes some time (~ 10s) for every operation (not only the first one).
BUG: 487824