vfio: Split the container logic into vfio_container_attach_group()

This splits up the ioctl of vfio_group_ioctl_set_container() so it
determines the type of file then invokes a type specific attachment
function. Future patches will add iommufd to this function as an
alternative type.

A following patch will move the vfio_container functions to their own .c
file.

Reviewed-by: Kevin Tian <[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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