- m68k fixes by Roman Zippel.

 - CDROM PIO mode fix by Osamu Tamita.
   (You are true "Hawk-eye" hovering over my head! Respect - and many Thanks.)

 - Virtualize the udma_enable method as well to help ARM and PPC people.  Please
   please if you would like to have some other methods virtualized in a similar
   way - just tell me or even better do it yourself at the end of ide-dma.c.
   I *don't mind* patches.

 - Fix the pmac code to adhere to the new API. It's supposed to work again.
   However this is blind coding... I give myself 80% chances for it to work ;-).