ix(4) on OpenBSD

The text 380fe037ffe4, as OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7, OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4 shipped it.

Intel 82598/82599/X540 PCI Express 10Gb Ethernet device