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

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

LinuxKPI: 802.11: minor header updates

- add comments for enum values constantly looked up, and another one to
a net80211 equivalent (should possibly re-define those in the future?)
- add another

LinuxKPI: 802.11: minor header updates

- add comments for enum values constantly looked up, and another one to
a net80211 equivalent (should possibly re-define those in the future?)
- add another nl80211_sta_info flag
- add enum environment_cap used in cfg80211.h in the future.

MFC after: 3 days

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LinuxKPI: 802.11 header updates and add/adjust source dependencies.

This update is for more/newer versions of drivers:
- add and properly place more structs, enums, defines needed by drivers.
- corr

LinuxKPI: 802.11 header updates and add/adjust source dependencies.

This update is for more/newer versions of drivers:
- add and properly place more structs, enums, defines needed by drivers.
- correct types of struct fields.
- make various function arguments const.
- move REG_RULE() macro to its own file regulatory.h and
use macros for calculations.
- add linuxkpi_ieee80211_get_channel() implementation.
- change linuxkpi_ieee80211_ifattach() to return int for error checking.

No intended functional changes for iwlwifi.

Sponsored by: The FreeBSD Foundation (partially)
MFC after: 3 days

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