vdpa/mlx5: support live migration

vdpa/mlx5: support live migration

Add support for live migration feature by the HW:
	Create a single Mkey that maps the memory address space of the
		VHOST live migration log file.
	Modify VIRTIO_NET_Q object and provide vhost_log_page,
		dirty_bitmap_mkey, dirty_bitmap_size, dirty_bitmap_addr
		and dirty_bitmap_dump_enable.
	Modify VIRTIO_NET_Q object and move state to SUSPEND.
	Query VIRTIO_NET_Q and get hw_available_idx and hw_used_idx.

Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>