Associated Press CHAPEL HILL—Freshman A.J. Griffin scored a season-high 27 points to help No. 9 Duke roll past rival North Carolina 87-67 on Saturday night in retiring Hall of Fame coach Mike Krzyzewski’s final visit to Chapel Hill. The Blue Devils shot 58% and took all drama out of the renewal of the famed rivalry early in both halves, both in building a big lead and then stretching it back out after the Tar Heels had made a run to climb back in it. The win allowed Duke (19-3, 9-2 Atlantic Coast Conference) to send Krzyzewski off with a 17th and final victory in the Smith Center, where he coa…