FROMLIST: dt-bindings: can: mcp251xfd: add gpio-controller property

The mcp251xfd has two pins that can be used as gpio. Add gpio-controller
property to binding description.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Gregor Herburger <gregor.herburger@ew.tq-group.com>
Signed-off-by: Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>
Link: https://lore.kernel.org/all/20251001091006.4003841-7-viken.dadhaniya@oss.qualcomm.com/

Author: Gregor Herburger

Documentation/devicetree/bindings/net/can/microchip,mcp251xfd.yaml

@@ -49,6 +49,11 @@ properties:
       Must be half or less of "clocks" frequency.
     maximum: 20000000
 
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+
 required:
   - compatible
   - reg