dt-bindings: gpio-mmio: Support hogs

We use hogs on some MMIO GPIO controllers so make sure the
bindings support this using a pattern property.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250822-ixp4xx-eb-mmio-gpio-v2-1-bd2edd4a9c74@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-mmio.yaml

@@ -89,6 +89,12 @@ properties:
     description:
       If this property is present, the controller cannot drive the GPIO lines.
 
+patternProperties:
+  "^.+-hog(-[0-9]+)?$":
+    type: object
+    required:
+      - gpio-hog
+
 required:
   - compatible
   - reg