Weren't Hardwick and Kyle Gass in this or something?Hello, Brooks Atkinson Theater — are you ready to rock? The Off Broadway musical “Rock of Ages” will be making its way onto Broadway (with a cocky, Mick Jagger-like strut, no doubt) in the spring, the show’s producers announced. “Rock of Ages,” which combines a narrative about an aspiring rocker and the small-town girl he loves with songs by Journey, Bon Jovi, Styx and many other 1980s hair bands, is to begin previews at the Atkinson on March 20 and to open on April 7. Its current Off Broadway run at New World Stages is to end on Jan. 4. New Line acquired the film rights to the musical this month; Chris D’Arienzo, who wrote the show’s book, is expected to write and direct the film.