The calls to Util.isTV and the interactions with the spatializer are
potentially blocking and were triggered from the constructor,
setAudioAttributes and release.
setAudioAttributes and release are both documented to be called by
the Player and should be triggered on the playback thread anyway.
The constructor initialization can be delayed until the spatializer
might be needed to avoid the blocking call.
The threading clean-up also allows to remove the lock from the
audioAttributes and the spatializer fields as they are now
accessed on the playback thread only.
PiperOrigin-RevId: 720488979
706c363104