“Geronimo,” chronicling the Apache war chief’s early years, goes before the cameras this spring for TNT.Norman Jewison and Chris Cook exec produce and Hanay Geiogamah (Kiowa) co-produces the film, which is being helmed by Roger Young from J.T. Allen’s script. “Geronimo” is part of Turner Broadcasting’s companywide initiative, “The Native Americans. Behind the Legends. Beyond the Myths.” MTV has officially added the animated ’60s series “Speed Racer” to its lineup , airing Monday-Friday at 1 a.m. and 6 a.m.(ET/PT). The Learning Channel reported that “Mongol Hordes: Storm from the East” scored a 1.0 rating March 8 from 10-11 p.m., the cabler’s highest prime time rating.