dt-bindings: can: m_can: change from additional- to unevaluatedProperties

This allows the usage of properties like termination-gpios and
termination-ohms, which are specified in can-controller.yaml
but were previously not usable due to additionalProperties: false.
Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>
Suggested-by: Rob Herring <robh@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Chandrasekar Ramakrishnan <rcsekar@samsung.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

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

@@ -128,7 +128,7 @@ required:
   - clock-names
   - bosch,mram-cfg
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |