vdpa/mlx5: function prototype modifications in preparation to control VQ

Use struct mlx5_vdpa_dev as an argument to setup_driver() and a few
others in preparation to control virtqueue support in a subsequent
patch. The control virtqueue is part of struct mlx5_vdpa_dev so this is
required.

Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210823052123.14909-3-elic@nvidia.com


Signed-off-by: Michael S. Tsirkin <mst@redhat.com>