General Motors Co. said it’s adjusting the work schedule for its Flint Assembly truck plant this Sunday so employees can watch the NFC Championship game between the Detroit Lions and the San Francisco 49ers. The winner of the game, which kicks off at 6:30 p.m., will advance to Super Bowl LVIII against the winner of the AFC Championship Game between the Kansas City Chiefs and the Baltimore Ravens. The automaker is delaying the shift start at the Flint plant that day from 9:45 p.m. to 10:45 p.m. None of the company’s other Michigan facilities operate on Sunday. Sunday’s contest at Levi’s Stadium…