dts: bindings: can: remove requirement for label property

Make the label property for CAN controller devicetree nodes optional.

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

dts/bindings/can/can-controller.yaml

@@ -5,8 +5,6 @@ include: base.yaml
 bus: can
 
 properties:
-    label:
-      required: true
     bus-speed:
       type: int
       required: true