Start Nearby from Connectivity ServiceInitializer

On T+, start and register Nearby services from the initializer, and send
proper callbacks.

Bug: 189355156
Test: Booted, service started
Ignore-AOSP-First: needs a dedicated change to resolve conflicts in
                   other branches
Change-Id: I7e280495f1eefada0939dad2ce7f47f45885ad66
2 files changed