alsa_sound: call voice volume api for direct output also

- Voip volume is not applied on direct output and as a result
  volume cannot be adjusted for some voicemail applications
  which opens direct output stream with mode set to IN_CALL.
- Voice volume is applied only for primary output and volume
  command is not sent to HAL for direct output.
- Call voice volume api for direct output as well from policy
  manager.

Change-Id: Iad6dc31ba628408958e4d693b99062f502210a56
CRs-Fixed: 676599