dt-bindings: gpio: realtek-otto: Add rtl9310 compatible

Add the "realtek,rlt9310-gpio", "realtek,otto-gpio" compatible for GPIO
nodes on the RTL931x SoC series.
Signed-off-by: Sander Vanheule <sander@svanheule.net>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml

@@ -29,6 +29,7 @@ properties:
           - realtek,rtl8380-gpio
           - realtek,rtl8390-gpio
           - realtek,rtl9300-gpio
+          - realtek,rtl9310-gpio
       - const: realtek,otto-gpio
 
   reg: true