dt-bindings: pinctrl: mediatek: mt7622: add "gpio-ranges" property

Allow specifying pin to GPIO mapping. It can be find in in-Linux DTS
file for MT7622.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Message-ID: <20240408105128.30586-1-zajec5@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/mediatek,mt7622-pinctrl.yaml

@@ -34,6 +34,9 @@ properties:
       the amount of cells must be specified as 2. See the below mentioned gpio
       binding representation for description of particular cells.
 
+  gpio-ranges:
+    maxItems: 1
+
   interrupt-controller: true
 
   interrupts: