By Nick Selbe Nets coach Steve Nash said the point guard has participated in 4-on-4 drills and is inching toward making his Brooklyn debut. A day before taking on the Celtics in Game 2 of their first round series, Nets coach Steve Nash offered a positive update on point guard Ben Simmons, keeping alive the possibility that the former All-Star could make his Brooklyn debut in the playoffs. Nash said that Simmons has been cleared for contact drills and has already participated in 4-on-4 sessions in practice, according to ESPN’s Nick Friedell. Simmons has not played during the entire 2021–22 regu…