dt-bindings: arm: bcm: add bindings for ASUS RT-AC3100

Add ASUS RT-AC3100 under BCM47094 based boards.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230803071454.5902-1-arinc.unal@arinc9.com


Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>