AudioService: BLE events clears routing+volume cache

In AudioDeviceInventory, BLE device connection/disconnection
was calling directly into AudioSystem, instead of the adapter
that handles volume and routing caching.

Bug: 350038911
Flag: EXEMPT bugfix
Test: adb shell dumpsys audio, check routing cache dump after BLE connection
Change-Id: I2a2d5c5232dcf1a7076b17b0ee08c715f43a7888