Tbs: Sets an active LE audio device when accepting calls

When accepting call from LE headset, call audio
should be routed to LE device even there is other active device on the
Android device.

This also fix scenario when peer device orginates the phonecall.

Bug: 232902624
Bug: 233006618

Tag: #feature
Test: atest BluetoothInstrumentationTests

Change-Id: I006d5762ba90fddd21fda261d6f3b99f84a29db4