The two Eagles coordinators believe there is no better venue in the NFL, and the home-field advantage could sway the outcome of a title game where matchups are so even PHILADELPHIA – Jonathan Gannon came to Philly for a Final Four game as a member of the Minnesota Vikings’ coaching staff when they played the Eagles in the 2018 NFC Championship Game. He and Vikings safety Harrison Smith looked at each other during warmups and Lincoln Financial Field was already humming like a tuning fork. “He looked at me with a look in his eye like, ‘whoa,’” said Gannon, who…