PHILADELPHIA — The Eagles took a significant step toward shoring up their secondary Wednesday, agreeing to sign veteran cornerback James Bradberry to a one-year deal. Bradberry, 28, was the New York Giants’ No. 1 cornerback last season, but the team released him for salary cap savings earlier this month. Bradberry’s contract is worth up to $10 million with incentives, according to an ESPN report. Pairing Bradberry, a Pro Bowler in 2020, with Darius Slay and Avonte Maddox will give the Eagles a formidable starting cornerback rotation with plenty of depth behind it. It came as a surprise when th…