config: make vfio-pci and {x,e,o,u}hci modules

config: make vfio-pci and {x,e,o,u}hci modules

Since 5.4 Ubuntu makes vfio-pci builtin to allow vfio-pci to be bound
to certain devices during boot, preventing other drivers from binding
them. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1770845

Part of why this was done was because it mirrored Arch Linux choice
in the past, but there where some issues and Arch Linux went back to
modules again but this time making xhci_hcd and similar ?hci systems
modules too. Tries to mirror the values used in the current Arch
Linux config [0].

[0]: https://git.archlinux.org/svntogit/packages.git/tree/trunk/config?h=packages/linux&id=96121a8d6468c7067eb3759f6ca5e82f5f914f38

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>