usb: Replace EHCI to UHCI/OHCI synchronization with new scheme.

The previous code attempts to correlate which UHCI and OHCI
controllers correlate with which EHCI controllers so that it can
ensure high speed devices are handled by the EHCI code while low/full
speed devices are handled by the UHCI/OHCI code.  Replace this logic
by initializing all EHCI controllers first, and then initializing all
UHCI and OHCI controllers.  This simplifies the code and improves
support for some hardware devices that don't follow the OHCI/UHCI to
EHCI correlation standard.

Also, remove the unused usb->busid field.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

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