virtio_vdpa: support the arg sizes of find_vqs()

Virtio vdpa support the new parameter sizes of find_vqs().

Signed-off-by: Bo Liu <liubo03@inspur.com>
Message-Id: <20220810085151.7251-1-liubo03@inspur.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>