G. Mike Mikan, the former interim CEO of Best Buy Co. Inc., has resigned from the board of the electronics retail giant — a move that may smooth the way for founder Richard Schulze to acquire the company. Mikan resigned Dec. 26, Richfield-based Best Buy (NYSE: BBY) said Monday in a filing with the U.S. Securities and Exchange Commission. Mikan, who has been a Best Buy director since 2008, said it was necessary to leave because he had accepted a position of president of Greenwich, Conn.-based…