dt-bindings: pinctrl: ocelot: add lan966x SoC support

Add documentation for the compatible designated for lan966x.

Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211118112548.14582-2-kavyasree.kotagiri@microchip.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>