dts: bindings: flexcan: add rdc property

Add rdc property to let RDC driver to configure RDC for flexcan.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>

Author: JiafeiPan

dts/bindings/can/nxp,flexcan-fd.yaml

@@ -25,4 +25,5 @@ description: |
 
 compatible: "nxp,flexcan-fd"
 
-include: ["nxp,flexcan.yaml", "can-fd-controller.yaml", "pinctrl-device.yaml"]
+include: ["nxp,flexcan.yaml", "can-fd-controller.yaml", "pinctrl-device.yaml",
+          "nxp,rdc-policy.yaml"]