rtw89: import Realtek's rtw89 driver
Import rtw89 based on wireless-testing at (tag: wt-2022-09-02)
78667a29c116c6b186a37e28cd8dd7fa9923aee8 with adjustments for FreeBSD.
For the moment this will stay disconnected from the build until the
last bits are flushed out, but this will help people with a card to
do testing and possibly help improving.
Given the lack of full license texts on non-local files this is
imported under the draft policy for handling SPDX files (D29226). [1]
Approved by: core.11 (imp) [1] [2022-03-27]
(cherry picked from commit 8e93258f2686c76b4e3b384a904d8b4413976229)