sys: Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

iwm(4): Remove _mvm from the namespace.

This was inherited from iwlwifi, which drives devices supported by both
iwn(4) and iwm(4) in FreeBSD. In iwm(4) _mvm is meaningless, so remove
it. OpenBSD made the same change a long time ago. No functional change
intended.

MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

[iwm] Enable Energy Based Scan (EBS).

This can significantly reduce scan duration thus saving time and power.
EBS failure reported by FW disables EBS for current connection. It is
re-enabled upon new connection attempt on any WLAN interface.

Obtained from: dragonflybsd.git 89f579e9823a5c446ca172cf82bbc210d6a054a4

[iwm] Add scan abort functions, to properly cancel a running scan.

* Uses the notification wait api to wait for the corresponding scan
complete notification after sending the abort command.

Taken-From: Linux iwlwifi

Obtained from: DragonflyBSD commit b484d09d54301740f036ddf02008117f563960c2

iwm(4) synchronize driver to DragonFlyBSD version and recent f/w update.

Submitted by: Kevin Bowling (kevin.bowling@kev009.com)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D6967

Import OpenBSD's iwm WiFi driver for Intel 3160/7260/7265.

There are still several bugs, but I've been using it for a while now.
Thanks to all the testers and to Adrian for his help with this
driver.

This driver isn't connected to the build yet, but it will be soon.

There's no MFC planned because the driver isn't very stable yet.

Reviewed by: adrian
Obtained from: https://github.com/rpaulo/iwm
Tested by: adrian, gjb, dumbbell (others that I forgot).
Relnotes: yes