Fix for MT call ringtone on USB headset

- Issue:when usb headset connected MT call ringtone heard
  only on speaker and expected behaviour is ringtone should
  be heard on both speaker and usb headset.
- Fixed by defining combo device usb proxy rx speaker

Change-Id: I0474651ed6fa40636038dcd7b25c7962cecc7239
CRs-Fixed: 443227
2 files changed
tree: 1809134e7b3d7b3b50b147c3a384da2993441507
  1. alsa_sound/
  2. audiod/
  3. libalsa-intf/
  4. mm-audio/