Cardinals sign three rookies

The Cardinals announced the signings of three rookies – centers Deveric Gallington and Kyle Quinn and defensive tackle Jonathan Mathis — on Tuesday. Quinn (6-4, 300) played at Arizona. Gallington (6-3, 315) is a Texas Tech product, while Mathis (6-2, 300) attended Texas A&M. In corresponding moves, the Cardinals waived wide receivers LaRon Byrd and Tyler Shaw and…