schsio(4) on OpenBSD

The text e2f9839587e9, as OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6 shipped it.

SMSC SCH311x LPC Super I/O