Sacheen Littlefeather, the actress and activist who declined Marlon Brando’s 1973 Academy Award for “The Godfather” on his behalf in an indelible protest of Hollywood’s portrayal of Native Americans, has died. She was 75. Littlefeather’s niece, Calina Lawrence, confirmed that she died peacefully Sunday, surrounded by loved ones at her Marin County, California, home. The…