consider using Settings app's SetupRedactionInterstitial for notification privacy settings

[inthewaves]

See https://github.com/GrapheneOS/platform_packages_apps_Settings/blob/15-qpr2/src/com/android/settings/SetupRedactionInterstitial.java.

This SetupRedactionInterstitial component is enabled when the user sets a PIN/password via SetupWizard: https://github.com/GrapheneOS/platform_packages_apps_Settings/blob/15-qpr2/src/com/android/settings/password/SetupChooseLockPassword.java#L145