rtwn: enable seqno offload; migrate to use ieee80211_output_seqno_assign()

This should both enable the sequence number offloading and disable
the net80211 TX lock from being acquired/released/checke

rtwn: enable seqno offload; migrate to use ieee80211_output_seqno_assign()

This should both enable the sequence number offloading and disable
the net80211 TX lock from being acquired/released/checked.

Locally tested:

* RTL8812AU, STA mode

Reviewed by: bz
Differential Revision: https://reviews.freebsd.org/D52301
Differential Revision: https://reviews.freebsd.org/D50693

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net80211 / LinuxKPI: 802.11: revert / redo enum ieee80211_sta_rx_bw

The initial thought of migrating the LinuxKPI 802.11 enum into net80211
for shared use did not work out well. Currently in the ne

net80211 / LinuxKPI: 802.11: revert / redo enum ieee80211_sta_rx_bw

The initial thought of migrating the LinuxKPI 802.11 enum into net80211
for shared use did not work out well. Currently in the need for yet
another adjustment, I decided to undo/de-couple net80211 and
LinuxKPI 802.11 again.

The enum name now gets used in LinuxKPI based wifi drivers and it
turns out it is spelt differntly than what I used initially.
This creates a conflict.

net80211 still in the need to be able to express BW_320 in an uint8_t
will likely be fine with the current solution as well. Rename the
enum and prefixes in net80211 to "net80211" instead of "ieee80211".
Apart from the names/prefix we leave the values the same.

In LinuxKPI add the enum with the expected name and use it there
throughout to make modern versions of LinuxKPI based wifi drivers
compile.

Sponsored by: The FreeBSD Foundation
Fixes: ca389486a9599, 2c8b0d6205f6f
MFC after: 3 days
Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D52064

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