Import the most recent versions of the firmware images for the
rtw88 driver.
This is based on linux-firmware at 681281e49fb6778831370e5d94e6e1d97f0752d6.
The license of the firmware matches the previous rtwnfw(4) firmware
files (modulo a Copyright year) and you can find a copy in
sys/contrib/dev/rtw88fw/LICENCE.rtlwifi_firmware.txt.
Add build infrastructure to create the .ko files but do not yet hook
it up to the build until all parts are in the tree.
Approved by: core (imp)
MFC after: 2 weeks
73d4ebea35