dt-bindings: pinctrl: mt7988: allow gpio-hogs

Allow gpio-hogs in pinctrl node for switching pcie on Bananapi R4 Pro.

Signed-off-by: Frank Wunderlich <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

Documentation/devicetree/bindings/pinctrl/mediatek,mt7988-pinctrl.yaml

···
   - "#gpio-cells"
 
 patternProperties:
+  "-hog(-[0-9]+)?$":
+    type: object
+    required:
+      - gpio-hog
+
   '-pins$':
     type: object
     additionalProperties: false