dt-bindings: can: xilinx_can: add Xilinx CAN FD 2.0 bindings

Add compatible string and new attributes to support the Xilinx CAN
FD 2.0.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/devicetree/bindings/net/can/xilinx_can.txt

@@ -6,6 +6,7 @@ Required properties:
 			  - "xlnx,zynq-can-1.0" for Zynq CAN controllers
 			  - "xlnx,axi-can-1.00.a" for Axi CAN controllers
 			  - "xlnx,canfd-1.0" for CAN FD controllers
+			  - "xlnx,canfd-2.0" for CAN FD 2.0 controllers
 - reg			: Physical base address and size of the controller
 			  registers map.
 - interrupts		: Property with a value describing the interrupt