Joe Otterson TV ReporterThe upcoming Apple series “The Changeling” has added Future Islands frontman Samuel T. Herring to the cast, Variety has learned.The role will mark Herring’s acting debut. He joins previously announced series lead LaKeith Stanfield in the series, along with cast members Adina Porter and Clark Backo.“The Changeling” is based on the book of the same name by Victor LaValle.