net/mlx5: Added support for 100Gbps per lane link modes

This patch exposes new link modes using 100Gbps per lane, including 100G,
200G and 400G modes.

Signed-off-by: Meir Lichtinger <meirl@mellanox.com>
Reviewed-by: Aya Levin <ayal@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>