mcx(4): Add Mellanox ConnectX-6 Lx from OpenBSD.
branches: 1.2.4; 1.2.10;mcx(4) will appear in 9.0
branches: 1.1.2;Add support for Mellanox 5th generation ethernet devices. This driversupports the ConnectX-4 Lx EN, ConnectX-4 EN, ConnectX-5 EN, andConnectX-6 EN adapters.Driver ported from OpenBSD.