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] Add iwm_mvm_send_lq_cmd() from Linux iwlwifi to if_iwm_util.c.

Obtained from: dragonflybsd.git 8a5dd7783e407856754093f5b1c9c757c64534b7

[iwm] Fix iwm_mvm_send_cmd_pdu(_status) declarations. Make id a uint32_t.

* This fixes cases where the group id of wide commands got lost, e.g. this
happened to the IWM_SCAN_ABORT_UMAC command.

Obtained from: dragonflybsd.git 71310fab0caca79bb5da43d9d642e77a4c27eea2

[iwm] Factor out firmware station handling into if_iwm_sta.c.

* This adds iwm_mvm_rm_sta(), which will be used to tear down firmware
state for better/cleaner iwm_newstate() handling.

* Makes iwm_enable_txq() and iwm_mvm_flush_tx_path() non-static, add
the declarations to if_iwm_util.h for now.

Obtained from: dragonflybsd.git 85d1c6190c4c3564b1a347f253e823aa95c202b2

[iwm] Allow listening on both chains/atennas to get diversity.

This might improve throughput slightly when far from the accesspoint,
apparently by allowing the firmware to listen on either of the two
antennas (if there are two, i.e. on 7260/7265/8260), whichever has
a better reception.

Obtained from: dragonflybsd.git 3b7fc5aac51f81062da0a2c8fdac23e683fbd548

[iwm] Add the BSS's basic rates to iwm's LQ command, not all the rates.

Makes the firmware use appropriate Tx rates for ACKs.

Obtained from: dragonflybsd.git ab1d3efc208e797c1e09759cd506c95c0aeaa06e

[iwm] Move iwm_dma_contig_alloc/_free functions to if_iwm_util.c.

Obtained from: dragonflybsd.git 83a1185edeede081051a6c00417d4c5a8f5988eb

[iwm] Sync valid_tx_ant and valid_rx_ant mask handling with iwlwifi.

* This fixes the phy_cfg field sent in the iwm_send_phy_cfg_cmd()
command, which wasn't taking into account the valid_rx_ant and
valid_tx_ant masks from nvm_data before.

Tested:

* 7260, STA mode, 2G and 5G

Obtained from: DragonflyBSD commit cbb82693c18fd71b4eb86855b82d03995f352d65

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