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
Merged-In: I7e280495f1eefada0939dad2ce7f47f45885ad66
Change-Id: Ieca032c80cb37e424d07c500257a844c8418fe3e
2 files changed