Perform legacy emulation handover for USB1 companion controllers immediately

but defer the remainder of their initialisation until after the other devices
on their PCI bus have attached.  This ensures that any USB2 controller has also
completed its initialisation before we start to initialise the USB1 parts.

This minimises the chance that a nasty SMM implementation will trash the USB1
controller's config when it performs legacy emulation handover of the USB2 part.

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