[Catalyst] Lock screen summary is not updated

In original implementation, DashboardFragment.onResume calls
AbstractPreferenceController.updateState to refresh preference. While
after Catalyst migration, it requires explicit update when external
dependency is changed.

Bug: 397798327
Flag: com.android.settings.flags.catalyst_lockscreen_from_display_settings
Test: adb shell settings put secure lock_screen_show_notifications/lock_screen_allow_private_notifications
Change-Id: I1c16d7df62cdb1cb53d365f2636aa1dc0a424839