edma_bit_set
edma_bit_set(sc->sc_parammask, 0);
edma_bit_set(sc->sc_parammask, idx);
edma_bit_set(sc->sc_dmamask, drq);
edma_bit_set(sc->sc_parammask, idx);
static void edma_bit_set(uint32_t *, unsigned int);