alsa_sound: Add support for seperated VOIP devices

 * Similar to the VOC devices tuned for voice calls, some new devices
   are using VOIP devices tuned for SIP and Hangouts.
 * Enable with BOARD_USES_SEPERATED_VOIP

Change-Id: I3a49be26ca2ad3e1aafb8b0960935ac8c735fe51