dt-bindings: net: can: Add support for Allwinner D1 CAN controller

The Allwinner D1 has two CAN controllers, both a variant of the R40
controller. Unfortunately the registers for the D1 controllers are
moved around enough to be incompatible and require a new compatible.

Introduce the "allwinner,sun20i-d1-can" compatible to support this.

Signed-off-by: John Watts <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]
Signed-off-by: Marc Kleine-Budde <[e-mail]>

Documentation/devicetree/bindings/net/can/allwinner,sun4i-a10-can.yaml

···
           - const: allwinner,sun4i-a10-can
       - const: allwinner,sun4i-a10-can
       - const: allwinner,sun8i-r40-can
+      - const: allwinner,sun20i-d1-can
 
   reg:
     maxItems: 1
···
 if:
   properties:
     compatible:
-      contains:
-        const: allwinner,sun8i-r40-can
+      enum:
+        - allwinner,sun8i-r40-can
+        - allwinner,sun20i-d1-can
 
 then:
   required: