ARM: dts: imx6qdl-apf6: add flow control to uart2

RTS/CTS lines are wired to the Bluetooth chip so add uart-has-rtscts
property to uart2.
Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-apf6.dtsi

@@ -32,6 +32,7 @@ ethphy1: ethernet-phy@1 {
 &uart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart2>;
+	uart-has-rtscts;
 	status = "okay";
 };