Rush Limbaugh, who’s been in the wilderness of Boston radio for the last few years, is returning to WRKO-AM (680), the station announced Monday. The right-wing “Rush Limbaugh Show,” which was on Talk 1200, will air from noon to 3 p.m. on ’RKO. “When we were presented with the opportunity to bring Rush back to WRKO, it was a no-brainer,” Jason Wolfe, VP of programming for Entercom Boston, said in a statement.