RDMA/ipoib: Add support for XDR speed in ethtool

RDMA/ipoib: Add support for XDR speed in ethtool

The IBTA specification 1.7 has new speed - XDR, supporting signaling
rate of 200Gb.

Ethtool support of IPoIB driver translates IB speed to signaling rate.
Added translation of XDR IB type to rate of 200Gb Ethernet speed.

Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Reviewed-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/ca252b79b7114af967de3d65f9a38992d4d87a14.1695204156.git.leon@kernel.org
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>