Grant default permissions to preinstalled VrListenerServices.

- While explicitly bound, the package for a single pre-installed
  VrListenerService will be granted permission to access
  notification policy, be bound as a notification listener service,
  and draw system overlays.

Bug: 22855417
Change-Id: I568d5d9c032e0926e47c8ef4b46e3910b6bdf766