GattService: No longer start a remote service

Since the Bluetooth app is self binding its own service, it does not
need to be started as a remote service.

Bug: 285959170
Bug: 294040500
Test: atest BluetoothInstrumentationTests
Test: atest ProfileServiceTest
Test: atest AdapterServiceTest
Test: atest AdapterServiceRestartTest
Test: atest AdapterServiceFactoryResetTest
Test: atest GattServiceTest
Test: boot bluetooth | having a working gattService is a unskippable
      step of startup. Simply booting the bluetooth validate this CL
Change-Id: I9474b0fc5d85b811b148698b143b4b3b03ba2756