sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

rtw88: downgrade rtw8822c firmware to 9.9.10

Firmware version 9.9.11 added support for hw_scan and is reportedly
causing more problems than 9.9.10 does. Until we get a chance to
test this out downgrade the firmware in order to help people testing
more.

Sponsored by: The FreeBSD Foundation
PR: 248235
MFC after: 2 days
X-MFC: just to get the reminder with the original commit
X-MFC with: 73d4ebea3567f18db549638c3d897b6d6758faa4

rtw88: import firmware for Realtek's rtw88 supported chipsets.

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