qahw: test: Send proxy device to hal to support playback over BT

To support A2DP src, output device should be set as proxy.
Modify test app to send output proxy device instead of A2DP device.

CRs-Fixed: 1081411
Change-Id: I9074a9468a765eda492c8c852ae37b0b2cfd9496
1 file changed