[C43][DT] comment out UART {RTS,CTS} GPIO

The RTS and CTS GPIOs are still not managed by the driver, comment them
out to make it clearer.

arch/arm64/boot/dts/seco/seco-imx8qm-c43.dts

@@ -441,8 +441,8 @@ &lpuart2 { /* RS232 */
 &lpuart3 { /* RS232 TTL */
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lpuart3>;
-	rts-gpios = <&lsio_gpio1 14 GPIO_ACTIVE_HIGH>;
-	cts-gpios = <&lsio_gpio1 15 GPIO_ACTIVE_HIGH>;
+	//rts-gpios = <&lsio_gpio1 14 GPIO_ACTIVE_HIGH>;
+	//cts-gpios = <&lsio_gpio1 15 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 };
 
@@ -450,7 +450,7 @@ &lpuart4 { /* RS485 */
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lpuart4>;
 	linux,rs485-enabled-at-boot-time;
-	rts-gpios = <&lsio_gpio0 19 GPIO_ACTIVE_HIGH>;
+	//rts-gpios = <&lsio_gpio0 19 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 };
 /*  __________________________________________________________________________