By Andrew Gould The NFL owners approved a new rule Tuesday that gives each team at least one possession in overtime playoff games. Those changes could directly impact Patrick Mahomes, who’s already seen his fair share of postseason overtime. In his first season as an NFL starter, he watched with no recourse as Tom Brady drove the New England Patriots down the field to win the AFC Championship Game. More recently, his Kansas City Chiefs pulled out a 42-36 thriller over the Buffalo Bills in the Divisional Round after winning the coin toss. However, he was unable to replicate that result in the A…