5/n: Add face settings

This change connects the face status preference controller with the
settings fragment/activity. This change also implements the basic settings
page showing a video, a toggle for keyguard, improve/remove targets,
and footer.

Bug: 111321762

Test: manual
Change-Id: Ifc65f5acbf6551679074df63ef22ffba75229f37

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -52,6 +52,7 @@ import com.android.settings.applications.specialaccess.pictureinpicture.PictureI
 import com.android.settings.applications.specialaccess.vrlistener.VrListenerSettings;
 import com.android.settings.backup.PrivacySettings;
 import com.android.settings.backup.ToggleBackupSettingFragment;
+import com.android.settings.biometrics.face.FaceSettings;
 import com.android.settings.bluetooth.BluetoothDeviceDetailsFragment;
 import com.android.settings.connecteddevice.AdvancedConnectedDeviceDashboardFragment;
 import com.android.settings.connecteddevice.ConnectedDeviceDashboardFragment;
@@ -187,6 +188,7 @@ public class SettingsGateway {
             PowerUsageSummary.class.getName(),
             AccountSyncSettings.class.getName(),
             AssistGestureSettings.class.getName(),
+            FaceSettings.class.getName(),
             SwipeToNotificationSettings.class.getName(),
             DoubleTapPowerSettings.class.getName(),
             DoubleTapScreenSettings.class.getName(),