PHOTO: A.J. Griffin in the Countdown to Craziness exhibition game against Jeremy Roach (3). Visit my websitehome page, TomShanahan.Report By TOM SHANAHAN Duke freshman A.J. Griffin arrived on campus confident in his basketball talent for plenty of good reasons, even though injuries limited his high school playing time the previous 24 months. First of all, he possessed the genes. His father, Adrian Griffin, played in the NBA and is now an assistant coach with the Toronto Raptors. Recruiting…