XXXX introduce drv_sectohz

*** 1767,1777 ****
           * which becomes zero when all data is submitted to DSD. But usbser
           * stays busy until it gets tx callback from DSD, signalling that
           * data has been sent over USB. To be continued in the next comment...
           */
          until = ddi_get_lbolt() +
!             drv_usectohz(USBSER_WQ_DRAIN_TIMEOUT * 1000000);
  
          while ((pp->port_wq_data_cnt > 0) && USBSER_PORT_IS_BUSY(pp)) {
                  if ((rval = cv_timedwait_sig(&pp->port_act_cv, &pp->port_mutex,
                      until)) <= 0) {
  
--- 1767,1777 ----
           * which becomes zero when all data is submitted to DSD. But usbser
           * stays busy until it gets tx callback from DSD, signalling that
           * data has been sent over USB. To be continued in the next comment...
           */
          until = ddi_get_lbolt() +
!             drv_sectohz(USBSER_WQ_DRAIN_TIMEOUT);
  
          while ((pp->port_wq_data_cnt > 0) && USBSER_PORT_IS_BUSY(pp)) {
                  if ((rval = cv_timedwait_sig(&pp->port_act_cv, &pp->port_mutex,
                      until)) <= 0) {