dt-bindings: arm: fsl: add nxp based toradex colibri-imx8x bindings

Document the NXP SoC based Toradex Colibri iMX8X module and carrier
board devicetree bindings previously added.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -279,6 +279,8 @@ properties:
           - enum:
               - einfochips,imx8qxp-ai_ml  # i.MX8QXP AI_ML Board
               - fsl,imx8qxp-mek           # i.MX8QXP MEK Board
+              - toradex,colibri-imx8x         # Colibri iMX8X Module
+              - toradex,colibri-imx8x-eval-v3 # Colibri iMX8X Module on Colibri Evaluation Board V3
           - const: fsl,imx8qxp
 
       - description: