DETROIT — Kemba Walker’s brief stint with the Pistons is likely coming to an end soon. The Pistons are expected to waive the four-time All-Star guard ahead of Monday’s deadline to set the regular-season roster, according to a report by The Athletic’s Shams Charania. The decision to release Walker puts Detroit at the required maximum of 15 guaranteed roster spots — 17 overall with the team’s two-way players. Walker, a 6-foot guard, was acquired by the Pistons in a trade on July 6 that brought No. 13 overall pick Jalen Duren to Detroit in exchange for a 2025 first-round draft pick (via the Milwa…