Saquon Barkley has a lightness to his step now that he’s changed teams, going from the Giants to the Eagles. Who cares if he flipped NFC East allegiances? The running back says he “feels like a rookie again,” as the Eagles, his new team, started phase three of OTAs. There no longer is a need to worry about contract negotiations. And with the switch in zip codes, Barkley goes from a team at the bottom to one that should compete for a Super Bowl berth. “Biggest thing that struck me is my first 7-on-7 huddle you see A.J. Brown, DeVonta Smith, Dallas Goedert and Jalen Hurts,” Barkley said. “It’s n…