register audio_enabled only when audio is set enabled
register audio_enabled only when audio is set enabled

ros-naoqi/alrosbridge,nlyubova/naoqi_driver,k-okada/naoqi_driver,ros-naoqi/naoqi_driver,ros-naoqi/naoqi_driver,k-okada/naoqi_driver,ros-naoqi/alrosbridge,nlyubova/naoqi_driver