Hlte: Remove custom audio code

  No need to use custom c code anymore.  We are able to use
  platform xmls, and translation in mixer_paths to achieve
  the same thing.
  Also, kanged from klte/intervigil

Change-Id: I2de426c34d4bdb043eb50861590819b9a1af19f9

Conflicts:
	audio/platform/customplatform.c