ath79: support switch LEDs on Archer C7 family

Add switch LED definitions for TP-Link Archer C7 v1/2/3 family, based on data
extracted from ar71xx board file. Update the LED labels to match current
pattern, i.e. drop the "tp-link:" prefix.

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/12487
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/ath79/dts/qca9558_tplink_archer-c.dtsi

@@ -4,6 +4,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
 
 / {
 	aliases {
@@ -129,6 +130,47 @@
 			0x7c 0x0000007e /* PORT0_STATUS */
 			0x94 0x0000007e /* PORT6 STATUS */
 			>;
+
+		leds {
+			led@0 {
+				reg = <0>;
+				color = <LED_COLOR_ID_GREEN>;
+				function = LED_FUNCTION_WAN;
+				qca,led-mode = <0>;
+			};
+
+			led@3 {
+				reg = <3>;
+				color = <LED_COLOR_ID_GREEN>;
+				function = LED_FUNCTION_LAN;
+				function-enumerator = <1>;
+				qca,led-mode = <0>;
+			};
+
+			led@6 {
+				reg = <6>;
+				color = <LED_COLOR_ID_GREEN>;
+				function = LED_FUNCTION_LAN;
+				function-enumerator = <2>;
+				qca,led-mode = <0>;
+			};
+
+			led@9 {
+				reg = <9>;
+				color = <LED_COLOR_ID_GREEN>;
+				function = LED_FUNCTION_LAN;
+				function-enumerator = <3>;
+				qca,led-mode = <0>;
+			};
+
+			led@12 {
+				reg = <12>;
+				color = <LED_COLOR_ID_GREEN>;
+				function = LED_FUNCTION_LAN;
+				function-enumerator = <4>;
+				qca,led-mode = <0>;
+			};
+		};
 	};
 };