AUBURN — Cam Coleman is still supposed to be in high school. In fact, he was headed to the prom on Saturday night as soon as he left the Auburn football facilities. But he’s not in high school. Instead, he’s winning offensive MVP honors as a true freshman in Auburn’s A-Day game. That’s something no other true freshman has ever done in the history of the program. “Experiencing the whole thing, I love the fans, it was just a great atmosphere. It was great energy around. It was a great experience overall,” Coleman said. “I would describe it as a learning experience. I’m still in high school. Not …