After sitting behind and learning from Spencer Rattler last season, LaNorris Sellers will get his chance to prove what he can do as a starting quarterback in the SEC. On Tuesday, head coach Shane Beamer officially named Sellers as the starter when South Carolina faces Old Dominion on Aug. 31. It’s a move that doesn’t come as a huge surprise. And judging by Sellers’ reaction, it wasn’t a big deal to him. “I texted him this morning to come by the office, and he didn’t see the text before the team meeting. So I talked to him about it on the practice field,” Beamer said. “It was the same conversat…