Add MSI support for xhci(4). Also add a quirk for some of the Fresco Logic controllers, taken from the Linux kernel.
Add MSI support for xhci(4). Also add a quirk for some of the Fresco
Logic controllers, taken from the Linux kernel.

ok mpi@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars