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

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

iwm(4): use correct channel list source for Intel 3168

Intel 3168 uses another EEPROM section to store channel flags;
port missing bits from iwlwifi to make it work.

PR: 230750, 236235
Tested by: Bert JW Regeer <xistence@0x58.com>
MFC after: 3 days

[iwm] Add support for iwm 3168 cards

```
iwm0@pci0:5:0:0: class=0x028000 card=0x21108086 chip=0x24fb8086
rev=0x10 hdr=0x00
vendor = 'Intel Corporation'
device = 'Dual Band Wireless-AC 3168NGW [Stone Peak]'
class = network
[94829] iwm0: <Intel(R) Dual Band Wireless AC 3168> mem
0xef700000-0xef701fff at device 0.0 on pci5
[94829] iwm0: hw rev 0x220, fw ver 22.361476.0, address
28:c6:3f:15:43:c5
```

MFC After: 2 weeks
Reviewed by: ivadasz (over IRC)
PR: 224886
Differential Revision: https://reviews.freebsd.org/D14865

[iwm] include opt_iwm.h and opt_wlan.h consistently in all files.

[iwm] Switch 7265D and 3165 devices to 7265D firmware.

Obtained from: dragonflybsd.git 0cb0a810cb4e04b30937cb4260e779f717a86492

[iwm] Move struct iwm_cfg chipset configs to if_iwm_7000.c and _8000.c

* This is more similar to how code/definitions are distributed in
Linux's iwlwifi.

* This should make recognizing new chipset variants, and adding additional
flags from the Linux iwlwifi code easier, without blowing up if_iwm.c

Obtained from: dragonflybsd.git 27d11320e707d2c41424efc1983762f6799941d6