realtekwifi/rtwn: Synchronize with FreeBSD trunk as of today.

A few changes ommitted (e.g. NET_EPOCH) as they are not needed.
Adds support for a variety of USB devices and one PCI device.

wlan: apply iwn,bwi,mwl commits from FreeBSD 13

iwn(4): (partially) rewrite A-MPDU Tx path

Generic Tx stats fixes:
- do not try to parse "aggregation status" for single frames; send them
to iwn_tx_done() instead;
- try to attach mbuf / node reference pair to reported BA events;
allows to fix reported status for ieee80211_tx_complete() and ifnet counters
(previously all A-MPDU frames were counted as failed - see PR 210211);
requires few more firmware bug workarounds;
- preserve short / long retry counters for wlan_amrr(4)
(disabled for now - causes significant performance degradation).
- Add new IWN_DEBUG_AMPDU debug category.
- Add one more check into iwn_tx_data() to prevent aggregation ring
overflow.
- Workaround 'seqno % 256' != 'current Tx slot' case (until D9195 is not
in the tree).
- Improve watchdog timer updates (previously watchdog check was omitted
when at least one frame was transmitted).
- Stop Tx when memory leak in currently used ring was detected (unlikely
to happen).
- Few other minor fixes.

Was previously tested with:
- Intel 6205, STA mode (Tx aggregation behaves much better now).
- Intel 4965AGN, STA mode (still unstable).

PR: 192641, 210211
Reviewed by: adrian, dhw
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D10728

iwn(4): drop return code from iwn_*attach functions (they cannot fail)

While here, add missing trace 'end' marker in iwn5000_attach().

MFC after: 1 week

iwn(4): drop i_seq field initialization for A-MPDU frames.

It is done by net80211 since r319460.

MFC after: 24 days
X-MFC-With: 343094

iwn(4): plug initialization path vs interrupt handler races

There are few places in interrupt handler where the driver
lock is dropped; ensure that device is still running before
processing remaining ring entries.

PR: 192641
MFC after: 5 days

iwn: Set default ampdu parameters.

These are from the linux iwlwifi driver ;the default use smaller
maximum AMPDUs (8k) and a much smaller density (none.) The latter
could cause stability issues.

Tested:

* Tested on Intel 6300, STA mode.

Differential Revision: https://reviews.freebsd.org/D25113

bwi: clean up empty lines in .c and .h files

mwl: clean up empty lines in .c and .h files

Fix ieee80211_radiotap(9) usage in wireless drivers:

- Alignment issues:
* Add missing __packed attributes + padding across all drivers; in
most places there was an assumption that padding will be always
minimally suitable; in few places - e.g., in urtw(4) / rtwn(4) -
padding was just missing.
* Add __aligned(8) attribute for all Rx radiotap headers since they can
contain 64-bit TSF timestamp; it cannot appear in Tx radiotap headers, so
just drop the attribute here. Refresh ieee80211_radiotap(9) man page
accordingly.

- Since net80211 automatically updates channel frequency / flags in
ieee80211_radiotap_chan_change() drop duplicate setup for these fields
in drivers.

Tested with Netgear WG111 v3 (urtw(4)), STA mode.

MFC after: 2 weeks

Change-Id: I7f194a3b78a058aa598634039cfab27e415a4894
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3917
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

realtekwifi: Sync with FreeBSD trunk.

This includes changes to support the 8188EE device, as well as a
number of critical bugfixes to 8192EE devices, which should make
the driver much more stable and reliable overall.

realtekwifi: Upgrade to FreeBSD 12.

This driver was completely rewritten and merged with its USB counterpart
in FreeBSD 12. I've imported the USB code, even though it's not compiled
in at all, because it's more than likely I'll get around to USB WiFi support
before FreeBSD 13 comes...

Untested, because I don't have one of these PCI devices.