hal: select loudspeaker mic when usb headphone is used for calls

In case an USB headphone is attached, loudspeaker mic should be used
instead of the handset mic.

Bug: 63680197
Bug: 64121918
Test: manual hangout and voice call
Change-Id: Ib7036b98c5331767827131e73d3e041bfbdaf7fe
Signed-off-by: David Lin <dtwlin@google.com>