dt-bindings: thermal: fsl,scu-thermal: Document imx8dl

imx8dxl also contains the SCU thermal block.

Add an entry for 'fsl,imx8dxl-sc-thermal'.

Cc: Rafael J. Wysocki <[e-mail]>
Cc: Daniel Lezcano <[e-mail]>
Cc: Amit Kucheria <[e-mail]>
Signed-off-by: Fabio Estevam <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/thermal/fsl,scu-thermal.yaml

···
 properties:
   compatible:
     items:
-      - const: fsl,imx8qxp-sc-thermal
+      - enum:
+          - fsl,imx8dxl-sc-thermal
+          - fsl,imx8qxp-sc-thermal
       - const: fsl,imx-sc-thermal
 
   '#thermal-sensor-cells':