Update LazyServiceRegistrar for tryUnregister.

This now successfully dissassociates. After b/111320612 it might make
sense to unregister all things at once (rather than unregister and
re-register).

Bug: 123318663
Test: drm tests w/ lazy drm
Change-Id: I853fd197d4da8cc9811e997282cedb8f9cb82365
1 file changed