AudioService: new headset profile management

Align BT Headset profile management with other profiles:
do not use intents for device connection indication but use
AudioManager.handleBluetoothActiveDeviceChanged()

Test: make
Bug: 265057196
Flag: android.media.audio.sco_managed_by_audio
Change-Id: I759c0e57b988aafbb63af9d4469e4c2206a2976d