Rename Indexable::getAllPreferenceControllers.

To getPreferenceControllers. "all" is redundant. Then internally, the
old getPreferenceControllers() is renamed to
createPreferenceControllers() to emphasize the controllers are created
from code (versus the ones created from xml).

Bug: 73668763
Test: robotest
Change-Id: Ifec46aefdc2a418031c8e152028b30bdcd396fc7

src/com/android/settings/security/LockscreenDashboardFragment.java

@@ -114,7 +114,7 @@ public class LockscreenDashboardFragment extends DashboardFragment
                 }
 
                 @Override
-                public List<AbstractPreferenceController> getPreferenceControllers(
+                public List<AbstractPreferenceController> createPreferenceControllers(
                         Context context) {
                     final List<AbstractPreferenceController> controllers = new ArrayList<>();
                     controllers.add(new LockScreenNotificationPreferenceController(context));