Simplify FDCAN configuration following candlelight example

- Remove bit-rate properties that are not declared in binding
- Use minimal FDCAN configuration like candlelight board
- Keep only pinctrl and status properties

firmware/canfd_cdc_composite/boards/arm/ews/ews.dts

@@ -64,8 +64,6 @@
 &fdcan2 {
 	pinctrl-0 = <&fdcan2_rx_pb0 &fdcan2_tx_pb1>;
 	pinctrl-names = "default";
-	bit-rate = <500000>;
-	bit-rate-data = <2000000>;
 	status = "okay";
 };