ARM: dts: imx6dl-plybas: Use the standard 'uart-has-rtscts'

The usage of the 'fsl,uart-has-rtscts' property is deprecated.

Use the standard 'uart-has-rtscts' instead.

Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-plybas.dts

@@ -214,7 +214,7 @@ &uart1 {
 &uart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart2>;
-	fsl,uart-has-rtscts;
+	uart-has-rtscts;
 	linux,rs485-enabled-at-boot-time;
 	rs485-rts-delay = <0 20>;
 	status = "okay";