ARM: dts: imx6qdl-gw5xxx: Remove the 'uart-has-rtscts' property

The 'uart-has-rtscts' property should be used when the board exposes the
native RTS and CTS UART pins.

On the imx6qdl-gw5xxx boards such pins are not used, so remove the
'uart-has-rtscts' property to make the hardware description correct.

Documentation/devicetree/bindings/serial/serial.txt states that
'uart-has-rtscts' and 'rts-gpios' properties are mutually exclusive.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-gw52xx.dtsi

@@ -377,7 +377,6 @@ &ssi1 {
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;
-	uart-has-rtscts;
 	rts-gpios = <&gpio7 1 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 };

arch/arm/boot/dts/imx6qdl-gw53xx.dtsi

@@ -368,7 +368,6 @@ &ssi1 {
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;
-	uart-has-rtscts;
 	rts-gpios = <&gpio7 1 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 };

arch/arm/boot/dts/imx6qdl-gw54xx.dtsi

@@ -416,7 +416,6 @@ &ssi2 {
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;
-	uart-has-rtscts;
 	rts-gpios = <&gpio7 1 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 };