Talk about Chicago theater, and soon the subject will turn to the director Robert Falls.Falls spent thirty-five years atop Goodman Theater and in 2015 was inducted into the National Theater Hall of Fame. But he stepped down from the Goodman a few years ago….launched a freelance career in his 70s… and this month, pops up in an unlikely place… Steppenwolf. WBEZ theater reporter Mike Davis sat down with Falls and talked about opening the play “Amadeus” at his former cross-town rival. HOST: LANE