sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

[ifconfig] Print more WPS attributes in verbose "list scan" output

- Move WPS related defines to dedicated file
- Add handlers for more WPS attributes

PR: 217317
Submitted by: J.R. Oldroyd <fbsd@opal.com>
MFC after: 3 weeks