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/display/PeakRefreshRatePreferenceController.java

@@ -119,6 +119,11 @@ public class PeakRefreshRatePreferenceController extends TogglePreferenceControl
                 mContext.getContentResolver(), Settings.System.PEAK_REFRESH_RATE, peakRefreshRate);
     }
 
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_display;
+    }
+
     @Override
     public void onStart() {
         mDeviceConfigDisplaySettings.startListening();