Adam B. Vary Senior Entertainment WriterWhen Maisie Williams was first offered “Pistol” — the FX limited series created by Craig Pearce and directed by Danny Boyle, about punk rock band the Sex Pistols for FX — she knew little about the band or the world of 1970s counterculture London that surrounded them. But the “Game of Thrones” star was instantly drawn to the role of Jordan (aka Pamela Rooke), whose provocative makeup and fashion made her a model and muse for Vivienne Westwood — and helped to catalyze the punk movement.