camera2ndk: ~ACameraCaptureSession shouldn't hold device lock in ACameraDevice_close().

We call disconnectLocked before stopping CameraDevice's looper, in order to avoid this situation:

1) Its possible that an OnResultReceived callback is received, and posts an
   AMessage with sp<ACameraCaptureSession> on CameraDevice's looper.

2) Before the looper message is processsed, ACameraDevice_close() is
   called by the client, which results in the looper being stopped and
   cleared with device lock held.

3) When the looper is getting cleared, the AMessage containg the
   ACameraCaptureSession pointer is destructed leading to
   ~ACameraCaptureSession running without knowing that the device is
   being closed, as a result it tries to hold device lock, resulting in
   a deadlock.

Bug: 141603005

Test: CTS native tests
Test: use camera2 vndk client for extended periods of time

Change-Id: Ia0d47fc2975981055cd1f2103c1cbe8d76642fe4
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>