Tracy Morgan.The diehard Knicks fan won’t eat anything at the World’s Most Famous Arena when he cheers on New York against the Cleveland Cavaliers in Game 4 of the Eastern Conference Playoffs Sunday, he dished to The Post.“Well I’m a pescatarian now, so all I eat is fish and vegetables, so I eat before I go,” he said.And the Bed-Stuy native isn’t about to get crabby when it comes to other celeb Knicks fans — the real ones and those only after front-‘roe’ photo ops.“Yo, listen, I can’t be calling people out like that,” he said. “If you a Knick fan, you a Knick fan at heart. I can’t be saying who’s not and who is.