XXXX introduce drv_sectohz

@@ -1549,11 +1549,11 @@
 
         /*
          * create a new timeout.
          */
         ac_hot_plug_timeout = timeout(ac_timeout, NULL,
-            drv_usectohz(ac_hot_plug_timeout_interval * 1000000));
+            drv_sectohz(ac_hot_plug_timeout_interval));
 
         mutex_exit(&ac_hot_plug_mode_mutex);
         return (0);
 }