vfio-pci/zdev: add open/close device hooks

During vfio-pci open_device, pass the KVM associated with the vfio group
(if one exists).  This is needed in order to pass a special indicator
(GISA) to firmware to allow zPCI interpretation facilities to be used
for only the specific KVM associated with the vfio-pci device.  During
vfio-pci close_device, unregister the notifier.

Signed-off-by: Matthew Rosato <[email protected]>
Acked-by: Alex Williamson <[email protected]>
Reviewed-by: Pierre Morel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Borntraeger <[email protected]>

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