ath79: add support of Netgear WNDR3800CH

Add support for the ar71xx supported Netgear WNDR3800CH to ath79.
The device is identical to WNDR3800 except NETGEAR_BOARD_ID.

Signed-off-by: Dmitry Tunin <hanipouspilot@gmail.com>
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/dts/ar7161_netgear_wndr3800ch.dts

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/dts-v1/;
+
+#include "ar7161_netgear_wndr3700.dtsi"
+
+/ {
+	compatible = "netgear,wndr3800ch", "qca,ar7161";
+	model = "Netgear WNDR3800CH";
+};
+
+&partitions {
+	partition@0 {
+		label = "u-boot";
+		reg = <0x000000 0x050000>;
+		read-only;
+	};
+
+	partition@50000 {
+		label = "u-boot-env";
+		reg = <0x050000 0x020000>;
+		read-only;
+	};
+
+	partition@70000 {
+		label = "firmware";
+		reg = <0x070000 0xf80000>;
+		compatible = "netgear,uimage";
+	};
+
+	art: partition@ff0000 {
+		label = "art";
+		reg = <0xff0000 0x010000>;
+		read-only;
+	};
+};
+