ethtool: Add support for 200Gbps (50Gbps per lane) link mode

Introduce 50Gbps per lane link modes and 200Gbps speed, update print
functions and initialization functions accordingly.
In addition, update related man page accordingly.

Signed-off-by: Aya Levin <ayal@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
3 files changed