By Tzvi Machlin Cleveland Browns quarterback Baker Mayfield is heading back to his old Oklahoma stomping grounds this weekend. And he has a message for Sooner Nation. Taking to Twitter, Mayfield recorded a video of himself at the Oklahoma football facility. He said he’s looking forward to meeting the former players ahead of Saturday’s spring game. “Sooner Nation, what’s up? Baker Mayfield here. I’m so excited to see all of you this weekend. It’s gonna be a great weekend with a ton of former players. Let’s have a great time. Let’s go!” Mayfield said. Oklahoma will be dedicating a statue to Mayf…