Use a no-op implementation of face auth interactor whenever FaceManager is not present

Fixes: 328783311
Test: everything builds, manually installed sysui on face auth supported device and face auth not supported device to verify lockscreen interactions work.
Flag: NONE no-op change because all methods in both the interactors return the
same values that were being returned previously in Face auth supported
and unsupported devices

Change-Id: Id35e391447c251b597b7c1ff242ecd08b2388b7e