kylin: audio: attach headset as default input/output kylin doesn't support headset detect now, so we should attach them in the audio_policy.conf Bug: 27274328 Test: brillo_audio_test --playback --libmedia --sine Change-Id: I8b0c59cbff3f6da5123024607c4d32cc254a9ae0 Signed-off-by: Jeffy Chen <[email protected]>