arm64: dts: imx8mp-verdin: 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: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-verdin-wifi.dtsi

@@ -61,7 +61,7 @@ &iomuxc {
 
 /* On-module Bluetooth */
 &uart4 {
-	fsl,uart-has-rtscts;
+	uart-has-rtscts;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_bt_uart>;
 	status = "okay";

arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi

@@ -760,14 +760,14 @@ &snvs_pwrkey {
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;
-	fsl,uart-has-rtscts;
+	uart-has-rtscts;
 };
 
 /* Verdin UART_2 */
 &uart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart2>;
-	fsl,uart-has-rtscts;
+	uart-has-rtscts;
 };
 
 /* Verdin UART_3, used as the Linux Console */