Elliptic ultrasonic proximity sensor's libnotifyaudiohal looks for
the audio HAL during elliptic's activate().

avc:  denied  { find } for interface=android.hardware.audio::IDevicesFactory sid=u:r:hal_sensors_default:s0 pid=970 scontext=u:r:hal_sensors_default:s0 tcontext=u:object_r:hal_audio_hwservice:s0 tclass=hwservice_manager permissive=0

Change-Id: Ibcd6693acb49c810e8ce1f0ea86cf2238ad10a70
Signed-off-by: Chenyang Zhong <zhongcy95@gmail.com>