The Asus RT-AX1800U is identical to the already supported Asus RT-AX53U.
Use the ALT0 buildroot tags to show both devices.
Tested-by: Marian Sarcinschi <znevna@gmail.com>
Signed-off-by: Felix Baumann <felix.bau@gmx.de>
(cherry picked from commit acd3b5e83b99879b326a940907a9ff334586f86b)