Remove masks from and fix 1-bit values for SPI registers
Remove masks from and fix 1-bit values for SPI registers

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