Merge branch 'net-800Gbps-support'

Petr Machata says:

====================
net: Add support for 800Gbps speed

Amit Cohen <amcohen@nvidia.com> writes:

The next Nvidia Spectrum ASIC will support 800Gbps speed.
The IEEE 802 LAN/MAN Standards Committee already published standards for
800Gbps, see the last update [1] and the list of approved changes [2].

As first phase, add support for 800Gbps over 8 lanes (100Gbps/lane).
In the future 800Gbps over 4 lanes can be supported also.

Extend ethtool to support the relevant PMDs and extend mlxsw and bonding
drivers to support 800Gbps.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>