[Catalyst] Migrate AmbientDisplayAlwaysOnPreferenceController

As the preference is exported as external settings, for safety, do not
update the preference key with datastore key. As a workaround, manage a
mapping between preference hierarchy key and datastore key.

Bug: 372307567
Flag: com.android.settings.flags.catalyst_lockscreen_from_display_settings
Test: devtool
Change-Id: I56126485061859b41216cd23b8e1caf63823a1ec

src/com/android/settings/SettingsPreferenceFragment.java

@@ -186,7 +186,7 @@ public abstract class SettingsPreferenceFragment extends InstrumentedPreferenceF
     }
 
     /** Returns if catalyst is enabled on current screen. */
-    protected final boolean isCatalystEnabled() {
+    public final boolean isCatalystEnabled() {
         // TODO(b/379130874): make Catalyst compatible with desktop device, such as user restriction
         // check.
         Context context = getContext();