kvm/vfio: Store the struct file in the kvm_vfio_group

Following patches will change the APIs to use the struct file as the handle
instead of the vfio_group, so hang on to a reference to it with the same
duration of as the vfio_group.

Reviewed-by: Kevin Tian <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Yi Liu <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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