Sometimes you want to go where everybody knows your show’s legacy — which is why the Emmys will host the casts of “Cheers” and “The Sopranos” next week in a tribute to series that changed the TV landscape. “Cheers” stars Ted Danson, Kelsey Grammer, Rhea Perlman, John Ratzenberger and George Wendt will team up with “Sopranos” stars Lorraine Bracco and Michael Imperioli to honor iconic shows of the last 75 years. “We’re going to be paying homage to them, having a lot of cast members come back as themselves, as these characters, and there’s going to be a little interchange between me and them on …