AudioService: new SCO audio connection management

The SCO audio link activation is not controlled by
audio service but similarly to A2DP or LE Audio by the
activation of the audio stream between the audio HAL and the
BT stack when a SCO audio device is selected.

Audio service still listens to the SCO audio link activation
to control the A2DP and LE audio suspend status.

Test: make
Bug: 265057196
Flag: android.media.audio.sco_managed_by_audio
Change-Id: I52f85c3f0aca23f15f9eaa8ccc83ca4bf0b00a2b