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
I didn't realize that the ringtone picker already has an option
to show a "Silent" item at the top, and having a separate silent
ringtone conflicts with that in apps that choose to show it.