Revert "Add javadoc about lifecycles for xml defined Controllers."

Revert submission 13804074-controller-lifecycle

Reason for revert: ag/182373167, see a crash related to this new cl.
Reverted Changes:
I39ac69f24:Use androidx LifecycleObserver for wiring up contr...
I086620e31:Add javadoc about lifecycles for xml defined Contr...

Change-Id: I6b539199de52432bb367303f5f78363886a05512
diff --git a/src/com/android/settings/core/BasePreferenceController.java b/src/com/android/settings/core/BasePreferenceController.java
index 95c94ce..c90fe48 100644
--- a/src/com/android/settings/core/BasePreferenceController.java
+++ b/src/com/android/settings/core/BasePreferenceController.java
@@ -30,7 +30,6 @@
 import android.util.Log;
 
 import androidx.annotation.Nullable;
-import androidx.lifecycle.LifecycleObserver;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
 
@@ -39,7 +38,6 @@
 import com.android.settings.slices.SliceData;
 import com.android.settings.slices.Sliceable;
 import com.android.settingslib.core.AbstractPreferenceController;
-import com.android.settingslib.core.lifecycle.Lifecycle;
 import com.android.settingslib.search.SearchIndexableRaw;
 
 import java.lang.annotation.Retention;
@@ -52,9 +50,6 @@
  * Abstract class to consolidate utility between preference controllers and act as an interface
  * for Slices. The abstract classes that inherit from this class will act as the direct interfaces
  * for each type when plugging into Slices.
- * <p>
- * Controllers defined in xml are automatically {@link Lifecycle#addObserver(LifecycleObserver)
- * wired up} to the settings lifecycle if they implement {@link LifecycleObserver}.
  */
 public abstract class BasePreferenceController extends AbstractPreferenceController implements
         Sliceable {