Audio packages: Allow stripping down via MINIMAL_NEWWAVELABS=true

Allows builds to specific MINIMAL_NEWWAVE_LABS=true to reduce the number
of newwavelabs/*.ogg that are included to one for ringtones, one for notifications.

This fixes the passion-userdebug + EMMA_INSTRUMENT=true, when
  MINIMAL_NEWWAVELABS=true is also specified.

Change-Id: I310e64e770c9b36af6bd01326d8606e46e34df79