dt-bindings: gpio: Add AXP221/AXP223/AXP809 compatibles

These PMICs each have 2 GPIOs with the same register layout as AXP813,
but without an ADC function.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220621034224.38995-2-samuel@sholland.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/gpio/x-powers,axp209-gpio.yaml

@@ -19,7 +19,13 @@ properties:
     oneOf:
       - enum:
           - x-powers,axp209-gpio
+          - x-powers,axp221-gpio
           - x-powers,axp813-gpio
+      - items:
+          - enum:
+              - x-powers,axp223-gpio
+              - x-powers,axp809-gpio
+          - const: x-powers,axp221-gpio
       - items:
           - const: x-powers,axp803-gpio
           - const: x-powers,axp813-gpio