dt-bindings: pinctrl: airoha: Add missing gpio-ranges property

Introduce leftover gpio-ranges property for Airoha EN7581 pinctrl binding

Fixes: d0c15cb9 ("dt-bindings: pinctrl: airoha: Add EN7581 pinctrl")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/20250307-en7581-gpio-range-v1-1-de1262105428@kernel.org


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