Are Bears preparing to move from Soldier Field to suburban stadium? from Sportsnaut, with Vincent Frank, and from YardBarker.com/www.yardbarker.com Soldier Field, the home of the NFL’s Chicago Bears, is among the most iconic sporting venues in North America. Opening up in 1924, it remains the oldest stadium in the entire NFL. That might not be the case moving forward. The Bears announced on Thursday that they submitted a bid to purchase Arlington International Racecourse in the Chicago suburb of Arlington Heights. “We recently submitted a bid to purchase the Arlington International Racecourse property,” Chicago Bears president Ted Phillips said in…