ar71xx: use Power-LED as Diag-LED on FRITZBox 4020

This commit makes use of the Power-LED as Diag-LED, allowing the LED to
work as a status indicator.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ar71xx/base-files/etc/board.d/01_leds

@@ -373,7 +373,6 @@ epg5000)
 	ucidef_set_led_wlan "wlan5g" "WLAN 5 GHz" "$board:blue:wlan-5g" "phy0tpt"
 	;;
 fritz4020)
-	ucidef_set_led_default "power" "Power" "$board:green:power" "1"
 	ucidef_set_led_netdev "lan" "LAN" "$board:green:lan" "eth1"
 	ucidef_set_led_netdev "wan" "WAN" "$board:green:wan" "eth0"
 	ucidef_set_led_wlan "wlan" "WLAN" "$board:green:wlan" "phy0tpt"

target/linux/ar71xx/base-files/etc/diag.sh

@@ -67,6 +67,7 @@ get_status_led() {
 	archer-c60-v2|\
 	archer-c7-v4|\
 	fritz300e|\
+	fritz4020|\
 	gl-usb150|\
 	mr12|\
 	mr16|\