This fixes a problem from Chris' patch, letting the driverfs files
work again.  The root cause was a duplicate "parent_dev" field,
now gone.  This also adds minor cleanup in the hcd glue, renaming
the value being duplicated as the "controller" that the HCD is
driving.  (A "parent" should rarely be used, but the "controller"
has reasonable uses all over the place ... like in dev_dbg calls!)
It's initted by the PCI bus glue, or by the SA-1111 bus glue.

Also makes some OHCI debug messages appear only when VERBOSE debug
is (manually) enabled.  This was self-defense, otherwise running
the link/unlink "usbtest" cases could fill up the log filesystem
(with debug enabled).