The preference will be accidentally shown if the device support HAP and
VCP. Make sure to hide the preference when the device doesn't have any
valid ambient control points.
Flag: EXEMPT bugfix
Test: manual test with real device
Test: atest BluetoothDetailsAmbientVolumePreferenceControllerTest
Bug: 388156028
Change-Id: I8162ce8e878baff414e4665c97aaf1c21aa51229