Remove specific audio changes

Alsa configurations enable to avoid them
For configuration instances you can check:
https://github.com/OpenBricks/openbricks/blob/master/packages/sound/alsa-lib/config/imx-spdif.conf
https://github.com/OpenBricks/openbricks/blob/master/packages/sound/alsa-lib/config/imx-hdmi-soc.conf

As alluded in #14 #62 and https://github.com/xbmc-imx6/xbmc/issues/68#issuecomment-51150477
it is for master and master-pr 
but I have already pushed it in the master-pr I am working on (sorry I was not able to get committed to the task this WE but I will on monday as I am on holidays)