Deprecate further Unknown* property values similarly to UnknownParity

Task-number: QTBUG-35215
Change-Id: Id8175af00c431cc8f80f05d518b3a2ee0e8ac71b
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>