gic_v3_gic_alloc_msix
static gic_alloc_msix_t gic_v3_gic_alloc_msix;
DEVMETHOD(gic_alloc_msix, gic_v3_gic_alloc_msix),
error = gic_v3_gic_alloc_msix(dev, sc->gic_mbi_start,