This adds support for RTL8812au/RTL8821au USB adapters.
Run-tested: x86/64/rockchip
USB adapters tested: Alfa AWUS036ACS, D-Link DWA-171 A1.
Signed-off-by: Marty Jones <mj8263788@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17079
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>