XXXX introduce drv_sectohz

*** 3327,3338 ****
   * connects us into devfs.
   */
  static void
  bridge_inst_init(void)
  {
!         bridge_scan_interval = 5 * drv_usectohz(1000000);
!         bridge_fwd_age = 25 * drv_usectohz(1000000);
  
          rw_init(&bmac_rwlock, NULL, RW_DRIVER, NULL);
          list_create(&bmac_list, sizeof (bridge_mac_t),
              offsetof(bridge_mac_t, bm_node));
          list_create(&inst_list, sizeof (bridge_inst_t),
--- 3327,3338 ----
   * connects us into devfs.
   */
  static void
  bridge_inst_init(void)
  {
!         bridge_scan_interval = drv_sectohz(5);
!         bridge_fwd_age = drv_sectohz(25);
  
          rw_init(&bmac_rwlock, NULL, RW_DRIVER, NULL);
          list_create(&bmac_list, sizeof (bridge_mac_t),
              offsetof(bridge_mac_t, bm_node));
          list_create(&inst_list, sizeof (bridge_inst_t),