ramips: add support for Netgear R6260 and R6850

As Netgear uses the same image for R6260, R6350 & R6850
we can merge device tree files and generate separate
images for each device.

Signed-off-by: Christoph Krapp <achterin@googlemail.com>
[add missing WiFi compatible string, fix network
configuration]
Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ramips/dts/mt7621_netgear_r6260.dts

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "mt7621_netgear_r6260_r6350_r6850.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "netgear,r6260", "mediatek,mt7621-soc";
+	model = "Netgear R6260";
+};
+
+&led_power {
+	label = "r6260:green:power";
+};
+
+&led_usb {
+	label = "r6260:green:usb";
+};
+
+&led_internet {
+	label = "r6260:green:wan";
+};
+
+&led_wifi {
+	label = "r6260:green:wifi";
+};