Remove $FreeBSD$: two-line .h pattern

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

lib80211: fix indentation of comments for some netbands.

Whitespace only; no functional changes.

MFC after: 2 weeks
Sponsored by: Rubicon Communications, LLC (d/b/a "Netgate")

[lib80211] add VHT bands and channel flags.

This is preparation work for 11ac support. The regulatory database
needs to know about VHT channel flags and 80MHz (and later 160MHz)
available channel bands.

Whilst here, add the 2GHz VHT band (which is a terrible, terrible vendor
extension that almost all vendors do) just in preparation, even though
I don't (yet) plan on supporting it.

Add lib80211, a small (but hopefully soon to grow) set of library
routines to interface with net80211.

This is all from the ifconfig program; the duplicate code from ifconfig
will be removed when it starts using this API.

Differential Revision: https://reviews.freebsd.org/D4290