audio: separate device for voice call

1. avoid to change gain as below scenarioes
- after call end, immediately music start with headset
- when device is changed from headset to speaker in voice call
  with touch effect sound, temporarily voice call gain is increased
  until changed to speaker

2. this commit set different configuration of voice and audio.

Change-Id: I89f1c1736d1ba56cb90a5e94f673b3f0439ab089
Signed-off-by: Iliyan Malchev <malchev@google.com>