Add USB MIC in case of AUDIO_SOURCE_CAMCORDER

A device which supports USB camera cannot record audio stream
because there is no definition of USB audio input device when
specifying CAMCORDER. For getting audio from USB camera,
AUDIO_DEVICE_IN_USB_DEVICE should be added as an audio input device
in case of CAMCORDER.

Test: run cts -m CtsCameraTestCases
Change-Id: I47140a4ae3c6a8c1b5ee1d4b302c97d860cb18d6