[xhci] Allow for non-PCI xHCI host controllers
Allow for the existence of xHCI host controllers where the underlying hardware is not a PCI device. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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Allow for the existence of xHCI host controllers where the underlying hardware is not a PCI device. Signed-off-by: Michael Brown <mcb30@ipxe.org>