Bring up: audio/msm8660: Fix for Mute not working in VoIP call

- In VoIp call mute option is not working
- Due to wrong device selection, PCM recording path is selected, instead
  of MVS Tx path, for VoIP tx.
- Enable MVS Tx path for VoIP uplink.

Based off 44e24a0ed00af92c53222d0d57e95b02f54c0f88 in jellybean.

Change-Id: I778220ed681f4d9136426c15248c528c405861e5