-  teaches the hardware-specific code to
   use urb->*_dma instead of creating mappings.
   (And tells ohci-sa1111 to init its buffer pools.)
   EHCI and UHCI also eliminated duplicated state;
   all the HCDs are now a smidgeon smaller.

Sanity checked by enumerating, including through
a hub, and using a USB Ethernet adapter, with each
of the three host controllers.

Worth noting:  this removes pci_dma_sync_single()
calls from UHCI.  On x86 (and some others) that's
a NOP, but for UHCI on other platforms (rare except
maybe on IA64, as I understand) this anticipates
the upcoming patch to remove interrupt automagic.
(I'll likely submit that after a Linus release that
catches up to your USB tree. :)