HLTE: Collapse primary audio outputs.

 * This appears to fix crackle on low-latency streams.
   modeled from http://review.cyanogenmod.org/62284
   BUGFIX: JIRA CYAN-4020

Change-Id: I4ad18f6a9a5e7fa6062c3bcd42d466a5c1291189

Patchset: 1
http://review.cyanogenmod.org/#/c/63547/