net80211: refactor out the AAD init code shared between GCMP and CCMP

The 802.11 specification specifically calls out that the GCMP AES
uses the CCMP AES specification, so we can re-use this here.

net80211: refactor out the AAD init code shared between GCMP and CCMP

The 802.11 specification specifically calls out that the GCMP AES
uses the CCMP AES specification, so we can re-use this here.

Changes during refactoring:

* the first block (b0) needs the priority field populated, which was
being done inline with the CCMP AAD assembly. So write a new function
that implements just that.

* Use IEEE80211_IS_QOS_ANY() in the AAD assembly; 802.11-2020
12.5.3.3.3 (Construct AAD) talks about frames with QoS control field,
not specifically QoS data frames (ie, not avoiding PS-POLL.)

* Use IEEE80211_IS_QOS_ANY() in the CCM nonce assembly.
Leave some verbose comments about the definition of "MPDU priority".

* mask the HTC/ORDER bit in the FC if the data frame contains a
QoS control field. Again, see 802.11-2020 12.5.3.3.3.

* Add extra comments about missing items and functionality for later
implementation.

Differential Revision: https://reviews.freebsd.org/D49367
Reviewed by: bz

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net80211: work around unused variable "vap" in non-debug builds

Don't declare a variable that's only used during debug builds.

net80211: add initial AES-GCMP crypto support

This adds initial AES-GCMP crypto support. It registers for both
128 and 256 bit support, although the 256 bit support will not work
without extending

net80211: add initial AES-GCMP crypto support

This adds initial AES-GCMP crypto support. It registers for both
128 and 256 bit support, although the 256 bit support will not work
without extending the net80211/ioctl keylength.

This is not yet enabled by default; drivers will need to opt-in
to supporting it in either hardware or software.

The AES-GCMP code is BSD licenced code from hostapd.git release 2.11.

Differential Revision: https://reviews.freebsd.org/D49161

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