Revisit audio routing policy when audio mode changed

When audio mode changed, if the active device for the audio mode
supports both A2DP and HFP, make the device be the active device
for both A2DP and HFP.

For example, let HS1 supports A2DP and HFP, and HS2 supports HFP
only. 1) HS1 connected and activated both A2DP and HFP, 2) HS2
connected and explitly activated by user in call, 3) the call ended,
then HS1 should be activated for both A2DP and HFP.

Bug: 299023147
Bug: 300174072
Test: atest BluetoothInstrumentationTests
Change-Id: Iac42fcb08d89aa8b77a8f0d7a314bd3aff87b566