Update PhonePolicy to support Multi-A2DP/Multi-HFP

Remove checks for A2DP and HFP that prevent auto-connecting a profile to
a second device if there is already a connected device for this profile.

Test: Manual with specific headset models
      Added unit test:
runtest bluetooth \
    --test-class com.android.bluetooth.btservice.PhonePolicyTest \
    --test-method testAutoConnectMultipleDevices
Bug: 72125048
Change-Id: I3017f5c99609516d3483800f2e72b56ea857d37c