hal: Add suport for dedicated VoIP devices

 * Some devices out there have dedicated paths for VoIP, add support
   for these by setting the system property.

Change-Id: I59cd97e78427f811559081a04151c9a2eccf452f
hal: Port fixes and features to msm8960 variant

Change-Id: I5c7a9ea64f4d6fc9e00e784bb36e208d7310fb5c
Merge branch 'CyanogenMod/cm-11.0'