XXXX introduce drv_sectohz

@@ -460,11 +460,11 @@
         struct vioblk_softc *sc = (void *)arg;
         clock_t deadline;
         int ret;
         bd_xfer_t xfer;
 
-        deadline = ddi_get_lbolt() + (clock_t)drv_usectohz(3 * 1000000);
+        deadline = ddi_get_lbolt() + drv_sectohz(3);
         (void) memset(&xfer, 0, sizeof (bd_xfer_t));
         xfer.x_nblks = 1;
 
         ret = ddi_dma_alloc_handle(sc->sc_dev, &vioblk_bd_dma_attr,
             DDI_DMA_SLEEP, NULL, &xfer.x_dmah);