acx(4) on OpenBSD

The text 64de9b9cf1d5, as OpenBSD 7.0, OpenBSD 6.9, OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5 shipped it.

TI ACX100/ACX111 IEEE 802.11a/b/g wireless network device