Migrate Smooth display

Test: manual test
Bug: 374936314
Bug: 368359268
Flag: com.android.settings.flags.catalyst_display_settings_screen
Change-Id: Iaacf72751806ca64018145531dd33d510dca7f6a

src/com/android/settings/display/DisplayScreen.kt

@@ -49,6 +49,7 @@ class DisplayScreen :
 
     override fun getPreferenceHierarchy(context: Context) = preferenceHierarchy(this) {
         +DarkModeScreen.KEY
+        +PeakRefreshRateSwitchPreference()
     }
 
     override fun isAvailable(context: Context) =