Support playing to uplink stream using the VOICE_CALL stream as well

Added support for playing audio to the uplink stream also using the
VOICE_CALL stream. This will ensure the uplink playback have the same
characteristics as other audio which is being played back during a call,
and can by pass the DND mute.

Change-Id: I1830bebb5fca724de561fbde8445fcee95f9c930
Test: tested manually.
Bug: 117866278.