Manziel’s college coach: If he wants to play, he has to change

In college, Johnny Manziel won a Heisman Trophy playing for Kevin Sumlin. In the NFL, Sumlin says, Manziel needs to clean up his act. Sumlin, the head coach at Texas A&M, told Bruce Feldman of FOX Sports that Manziel’s off-field act is a major problem: “The things you see on TMZ, without a doubt, are…