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When an EHCI hotplug action results in the controller disowning the port, it will result in a hotplug action on the corresponding UHCI or OHCI controller. Allow such hotplug actions to be carried out as part of the same call to usb_step() or usb_register_bus(), by maintaining a single central list of changed ports. Signed-off-by: Michael Brown <mcb30@ipxe.org>