audio policy fix: allow cocurrent capture for VOICE_DOWNLINK,

VOICE_CALL, VOICE_UPLINK.

This update will allow features like Call Screen (go/callscreen), Tap to Caption (go/whatist2c) and
Tulip (go/tulip) to work simultaneously.

Bug: b/124457248
Test: Manual testing. See videos in folder: http://go/audio-fix-videos
and README.txt

Change-Id: Ic279dde6c99eca51b880bb340dfc3235d8680121