iwlwifi: update driver from upstream

This is a combined versions of updates of the iwlwifi driver based
on wireless-testing
(wt-2023-05-11) 711dca0ca3d77414f8f346e564e9c8640147f40d (after v6.4-rc1).
(wt-2023-06-09) 7bd20e011626ccc3ad53e57873452b1716fcfaaa (after v6.4-rc5).
(wt-2023-07-24) 62e409149b62a285e89018e49b2e115757fb9022 (after v6.5-rc3).

Sponsored by: The FreeBSD Foundation
MFC after: 20 days

iwlwifi: update driver from iwlwifi-next

Import code update from iwlwifi-next
at e89600ebeeb14d18c0b062837a84196f72542830.

This amongst other things removes the deprecated BCAST_FILTERING option,
which we had disabled before due to firmware issues.
Also prepares us for the next firmware update.

The "enable_ini" module option has become an integer with a
sysctl proc equivalent handler. Disable the module parameter changing
for the moment until we'll have working LinuxKPI support or implement
it as SYSCTL_PROC in FreeBSD directly.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

iwlwifi: import Intel's iwlwifi/mvm driver.

Over the past few months we published multiple snapshots for this
Linux derived driver and it has become fairly stable in terms of
minimal local changes needed for new updates.

The current version is based on iwlwifi-next update at
cbaa6aeedee5f92dafa5982eceea2a1f98ce4f7d with the addition of
a hand full of files replaced for FreeBSD.

Given the lack of full license texts on non-local files this is
imported under the draft policy for handling SPDX files (D29226). [1]

Do not yet hook this to the build until the remaining compat code
is all in. Along with the firmware import this will make publishing
the last bits and final testing a lot easier.

Sponsored by: The FreeBSD Foundation
Approved by: core (imp) [1]
MFC after: 10 days