Correctly handle GATT as only profile supported.

If GATT is the only profile enabled in config.xml, then AdapterService
will hang indefinitely since setProfileServiceState ignores GATT. This
is okay generally since GATT comes up with BLE, not with BREDR. But since
GATT is already running at this point, AdapterService will never know
that we can consider BREDR started.

Fix this by shortcutting to BREDR_STARTED in the case that we're trying
to start core services and GATT is the only supported profile.

Bug: 62415118 69965109
Test: Build ok
Change-Id: I47f7d0c21bb21773d5317fb264aa9adce8f5823e