IB/mlx5: Expose XDR speed through MAD

Under MAD query port, Report NDR speed when NDR is supported in the port
capability mask.

Signed-off-by: Or Har-Toov <ohartoov@nvidia.com>
Reviewed-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/d30bdec2a66a8a2edd1d84ee61453c58cf346b43.1695204156.git.leon@kernel.org


Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>