Add highlight menu keys for all toggle pref controllers and custom slices

Bug: 204695404
Test: manual, robotest build pass, unit
Change-Id: Iad2e28ada8ddb766ffa7eff2c8dc581250cbd6f8

src/com/android/settings/dream/StartNowPreferenceController.java

@@ -20,6 +20,7 @@ import android.content.Context;
 
 import androidx.preference.Preference;
 
+import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.widget.SettingsMainSwitchPreferenceController;
@@ -67,4 +68,9 @@ public class StartNowPreferenceController extends SettingsMainSwitchPreferenceCo
         }
         return true;
     }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_display;
+    }
 }