arm64: dts: rockchip: Enable RS485 for edgeble-neu6b

Add RS485 support for Edgeble Neu6B NCM IO board.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230713143941.1756849-8-jagan@edgeble.ai
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: openedev

arch/arm64/boot/dts/rockchip/rk3588-edgeble-neu6b-io.dts

@@ -84,3 +84,10 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+/* RS485 */
+&uart7 {
+	pinctrl-0 = <&uart7m2_xfer>;
+	pinctrl-names = "default";
+	status = "okay";
+};