vfio/pci: Move to the device set infrastructure

PCI wants to have the usual open/close_device() logic with the slight
twist that the open/close_device() must be done under a singelton lock
shared by all of the vfio_devices that are in the PCI "reset group".

The reset group, and thus the device set, is determined by what devices
pci_reset_bus() touches, which is either the entire bus or only the slot.

Rely on the core code to do everything reflck was doing and delete reflck
entirely.

Signed-off-by: Yishai Hadas <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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