Ensure we always bind to overview service when starting up

- Previously, the registration of the device provisioned callback
  triggered the overview service to be started, but the switch
  to current user tracker removed that path

Bug: 158321453
Test: Kill sysui and verify we start the service
Change-Id: I9221389b0b1ef3298a93ed8daae7e026bcf772e8
1 file changed