ramips: harmonize Netgear R6120 DT LED node names

This changes the node names for the LEDs in the Netgear R6120
device-tree file to provide consistency with other devices.

Signed-off-by: Alex Lewontin <alex.c.lewontin@gmail.com>
[improve commit title/message]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ramips/dts/mt7628an_netgear_r6120.dts

@@ -40,17 +40,17 @@
 			gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
 		};
 
-		wlan {
+		wlan2g_green {
 			label = "r6120:green:wlan2g";
 			gpios = <&gpio1 10 GPIO_ACTIVE_LOW>;
 		};
 
-		wlan_orange {
+		wlan2g_orange {
 			label = "r6120:orange:wlan2g";
 			gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
 		};
 
-		wan {
+		wan_green {
 			label = "r6120:green:wan";
 			gpios = <&gpio1 8 GPIO_ACTIVE_LOW>;
 		};