XXXX introduce drv_sectohz

*** 177,187 ****
          clock_t         xwait;
          clock_t         wait_rv;
          int             rv;
  
          /* wait time used on successive retries */
!         xwait = drv_usectohz(vsw_setup_switching_delay * MICROSEC);
  
          CALLB_CPR_INIT(&cprinfo, &vswp->sw_thr_lock, callb_generic_cpr,
              "vsw_setup_sw_thread");
  
          mutex_enter(&vswp->sw_thr_lock);
--- 177,187 ----
          clock_t         xwait;
          clock_t         wait_rv;
          int             rv;
  
          /* wait time used on successive retries */
!         xwait = drv_sectohz(vsw_setup_switching_delay);
  
          CALLB_CPR_INIT(&cprinfo, &vswp->sw_thr_lock, callb_generic_cpr,
              "vsw_setup_sw_thread");
  
          mutex_enter(&vswp->sw_thr_lock);