TIF: fix loud volume after input switch when volume is 0

        private AudioDevicePort mAudioSource;

        private List<AudioDevicePort> mAudioSink = new ArrayList<>();

        private AudioPatch mAudioPatch = null;

        private float mCommittedVolume = 0.0f;

        // Set to an invalid value for a volume, so that current volume can be applied at the

        // first call to updateAudioConfigLocked().

        private float mCommittedVolume = -1f;

        private float mSourceVolume = 0.0f;

        private TvStreamConfig mActiveConfig = null;