The Pittsburgh Penguins haven’t seen the best of Mikael Granlund, but maybe playing against the Nashville Predators will spark something. PITTSBURGH – Mikael Granlund hasn’t had the greatest run to start his tenure with the Pittsburgh Penguins, but maybe playing against his former team will bring an extra level. The Penguins kickoff a three-game homestand with a game against the Nashville Predators, the team Granlund called home for parts of five seasons. “When you play a former team,” head coach Mike Sullivan said. “There’s always a little bit of extra juice and motivation to want to play well.” In his…