AudioDeviceInventory: add BT device identity address

Add the identity address to the DeviceInfo record for connected
Bluetooth A2DP and LE devices and use it to match the head tracking
sensor ID.

Bug: 315031589
Test: regression tests for spatial audio with head tracking
Change-Id: Ia5e29a8af9e8495eef864b9c05e3fdd0bf39e91a