Complete the removal of consumer-based load API method. Update the
publisher-based 'publisherForAllAvailable()' to be non-null and
abstract, indicating it is now a required method.
Bug: 149398610
Test: atest ControlsBindingControllerImplTest ServiceWrapperTest
ControlsProviderLifecycleManagerTest
Test: ControlProviderServiceTest
Change-Id: Id06a24d2facf7621e8985ebe0396092752b6f59d