MFC r319578:

[iwm] Check for lar_disable tunable, and lar_enabled flag from NVM.

* LAR can be disabled with the hw.iwm.lar.disable tunable now.

* On Family 8000 devices we need to check the lar_enabled flag from
nvm_data in addition to the TLV_CAPA_LAR_SUPPORT flag from the firmware.

* Add a separate IWM_DEBUG_LAR debugging flag.

MFC r314192,r314209:

[iwm] Add support for Firmware paging, needed for newer 8000C firmware.

* Uses the IWM_FW_PAGING_BLOCK_CMD firmware command to tell the firmware
what memory ranges to use for paging.

MFC r313417:

[iwm] Very basic DTS thermal sensor support (prints temp as debug msg).

* Adds IWM_DEBUG_TEMP debug message type, for printing messages related
to temperature sensors and thermal/TDP infos.

* The firmware regularly sends us DTS measurement notifications, so just
print the temperature value as a debugging message.

(Adrian's addition):

* Eventually this can be used by the driver to limit transmit rate / power to
try and do some thermal throttling.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

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