PHILADELPHIA — After trading up two spots, the Eagles selected Georgia defensive tackle Jordan Davis with the No. 13 pick in the NFL draft. Davis is a physical specimen who has the potential to develop into an impact player for the Eagles. The 6-foot-6, 341-pound lineman was considered one of the most athletic prospects at this year’s scouting combine, where he ran a 4.78-second 40-yard dash and had a 123-inch broad jump at the scouting combine. How he fitsThe Eagles had an early advantage on scouting Davis thanks to his longstanding relationship with defensive line coach Tracy Rocker, who rec…