arm:dts:nallino: activate fix for rs485 latency issue

Signed-off-by: Mikhail Vanyulin <mikhail.vanyulin@rtsoft.de>

arch/arm/boot/dts/seconorth/imx6ull-nallino.dts

@@ -794,6 +794,7 @@ &uart1 {
 	pinctrl-0 = <&pinctrl_uart1>;
 	fsl,uart-has-rtscts;
 	linux,rs485-enabled-at-boot-time;
+	rs485-has-rts-latency;
 	status = "okay";
 };