dt-binding: can: m_can: include common CAN controller bindings

Since commit

| 1f923440 ("dt-bindings: can: add can-controller.yaml")

there is a common CAN controller binding. Add this to the m_can
binding.

Link: https://lore.kernel.org/all/20220124220653.3477172-4-mkl@pengutronix.deReviewed-by: Chandrasekar Ramakrishnan <rcsekar@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/devicetree/bindings/net/can/bosch,m_can.yaml

@@ -11,6 +11,9 @@ description: Bosch MCAN controller for CAN bus
 maintainers:
   - Chandrasekar Ramakrishnan <rcsekar@samsung.com>
 
+allOf:
+  - $ref: can-controller.yaml#
+
 properties:
   compatible:
     const: bosch,m_can