OS-2366 ddi_periodic_add(9F) is entirely rubbish

*** 24,33 ****
--- 24,37 ----
   */
  
  /*      Copyright (c) 1988 AT&T */
  /*        All Rights Reserved   */
  
+ /*
+  * Copyright (c) 2013, Joyent, Inc. All rights reserved.
+  */
+ 
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/sysmacros.h>
  #include <sys/pcb.h>
  #include <sys/systm.h>
*** 413,423 ****
           */
          startup();
          segkmem_gc();
          callb_init();
          cbe_init_pre(); /* x86 must initialize gethrtimef before timer_init */
!         timer_init();   /* timer must be initialized before cyclic starts */
          cbe_init();
          callout_init(); /* callout table MUST be init'd after cyclics */
          clock_tick_init_pre();
          clock_init();
  
--- 417,427 ----
           */
          startup();
          segkmem_gc();
          callb_init();
          cbe_init_pre(); /* x86 must initialize gethrtimef before timer_init */
!         ddi_periodic_init();
          cbe_init();
          callout_init(); /* callout table MUST be init'd after cyclics */
          clock_tick_init_pre();
          clock_init();