By Andrew Holleran NBA fans will be hearing a familiar voice this postseason. Longtime college basketball and college football announcer Gus Johnson will be on the call of some NBA playoff games this spring. Johnson, who works for FOX, will be part of Turner Sports’ NBA playoff coverage this spring. “Fox Sports broadcaster Gus Johnson will call NBA playoff games for TNT this year, working alongside Greg Anthony on Raptors-Sixers Game 2 Monday night and Bulls-Bucks Game 2 on Wednesday. Johnson called some NBA Summer League games last season and has served as an occasional voice of the Milwaukee…