bluetooth: Deregister battery provider when profile disconnects

Whenever a device disconnects the device is not removed from BlueZ, only
the profiles that had an active connection are disconnected. Since we
were providing this battery level based on AT commands received through
HSP/HFP these services should be responsible for deregistering it again.

Deregister the interface to signal BlueZ (And UPower in return) that the
battery level won't be accurate/updated anymore.
3 jobs for battery-provider in 4 minutes and 10 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Container
passed #7440889
build-container

00:00:11

 
  Build
passed #7440890
build-autotools

00:03:58

passed #7440891
build-meson

00:01:05