ramips: add button support and make LEDs known to userspace for DIR-860L B1

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Reviewed-by: Jo-Philipp Wich <jo@mein.io>

target/linux/ramips/dts/DIR-860L-B1.dts

@@ -44,6 +44,18 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 		poll-interval = <20>;
+
+		reset {
+			label = "reset";
+			gpios = <&gpio0 7 1>;
+			linux,code = <0x198>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&gpio0 18 1>;
+			linux,code = <0x211>;
+		};
 	};
 };