dt-bindings: gpio: nomadik: add optional ngpios property

This GPIO controller can support a lesser number of GPIOs than 32.
Express that in devicetree using an optional, generic property.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://lore.kernel.org/r/20240228-mbly-gpio-v2-2-3ba757474006@bootlin.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/gpio/st,nomadik-gpio.yaml

@@ -51,6 +51,10 @@ properties:
   gpio-ranges:
     maxItems: 1
 
+  ngpios:
+    minimum: 0
+    maximum: 32
+
 required:
   - compatible
   - reg