bnxt(4) on OpenBSD

The text 970ef1a688f2, as OpenBSD 7.5, OpenBSD 7.4, OpenBSD 7.3, OpenBSD 7.2, OpenBSD 7.1, OpenBSD 7.0 shipped it.

Broadcom NetXtreme-C/E 10Gb/25Gb/40Gb/50Gb Ethernet device