Fix XML preference controller with androidx LifecycleObserver

Controller can implements LifecycleObserver to observe the lifecycle.

Before this fix, preference controller which defined in the XML file
must implement com.android.settingslib.core.lifecycle.LifecycleObserver
(which is deprecated, and is a subclass of
androidx.lifecycle.LifecycleObserver).

After this fix, preference controller which defined in the XML file
and implemented androidx.lifecycle.LifecycleObserver will successful
observe the lifecycle.

Fix: 149338098
Test: robotest & manual
Change-Id: If9e48e44267de8e89a5e8f45d256719130936320