In Private space settings when no face support show only fingerprint unlock

This contains fix for PS biometrics issue in Pixel devices without
face hardware support.

In private space separate lock settings page
- without face support only fingerprint unlock controller is shown
- with face support controller for both face and fingerprint is shown.

Screenshot:
-Without Face support
go/ss/qhDqdyqYLCTYaJq.png
go/ss/4Jw54XKJPNYm4R6.png
go/ss/5LPjRQ76cVPZy7j.png

-if without Fingerprint
go/ss/ACGqKU7j24G3Q9Q.png

-With Face support
go/ss/7jV385WCFsXajZM.png
go/ss/ZrGTdiYUN5MFY3r.png
go/ss/6QNKqaFuZvuMJZ9.png
go/ss/9ZcSvXULHuPK2ps.png
go/ss/7GfABcYE4h8BkCo.png

Bug: 319794904
Test: Manual
Change-Id: I053e8584d036ca0d6e3d8157d0fdef6d465492aa