usb_hub: Trigger only chaged port on enumeration
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Authored by aokblast on Fri, May 8, 5:15 PM.

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Summary

USB hub records changed ports in every hotplug event interrupt.
Instead of reading port status one by one, we use the data from the
callback to speedup enumeration.
Host Controller also does the same thing. But we don't plan to fix it in
this patch since it requires to aggregate all Port Status Changed TRB.