fw: update fault handler to use libgreat, instead of libopencm3
fw: update fault handler to use libgreat, instead of libopencm3

greatscottgadgets/greatfet,greatscottgadgets/greatfet,dominicgs/GreatFET-experimental,dominicgs/GreatFET-experimental,greatscottgadgets/greatfet,dominicgs/GreatFET-experimental,greatscottgadgets/greatfet