LOS ANGELES — Organizations representing Hispanics, Asian-Americans and Native Americans, who joined with the NAACP in 2000 to increase minority hiring in the TV industry, are broadening their focus to the big screen.The Multi-Ethnic Media Coalition called Thursday on Sony, Warner Bros., Fox, Universal, Paramount and Disney to enter discussions aimed at bringing full diversity to on- and off-camera jobs, including the executive ranks.The uproar over this year’s all-white cast of Academy Award acting nominees …