Fix camera2.cts.CameraManagerTest.testManagerGetDeviceIdList for TV.

TV Camera is defined as an EXTERNAL CAMERA, and the lensFacing is set LENS_FACING_EXTERNAL.
But CTS test case has not added the code to handle the external camera.
Change the CTS code to support external Camera.

Change-Id: I0ac0957e5589e5b056c6bcf0a47907dbb4fc05d4
1 file changed