dt-bindings: ARM: add bindings for the D-Link DIR-890L

The DIR-890L is a router similar to DIR-885L just a bit different.

Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221107134104.1422169-1-linus.walleij@linaro.org


Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>