apm821xx: redo WAN green and yellow LEDs

Because the WAN port is handled by the internal AR8327N switch, the
device should use swconfig_leds trigger to handle the link activity
of the WAN LED. This has the added bonus that the WAN LED will now
go dark if there's no ethernet cable connected to the WAN port.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/base-files/etc/board.d/01_leds

@@ -22,7 +22,8 @@ mbl)
 
 wndr4700)
 	ucidef_set_led_ide "sata" "SATA" "wndr4700:green:hd"
-	ucidef_set_led_netdev "wan" "WAN (green)" "wndr4700:green:wan" "eth0.2"
+	ucidef_set_led_switch "wan_green" "WAN (green)" "wndr4700:green:wan" "switch0" "0x20"
+	ucidef_set_led_netdev "wan_yellow" "WAN (yellow)" "wndr4700:yellow:wan" "eth0.2" "tx rx"
 	ucidef_set_led_usbport "usb3" "USB3" "wndr4700:blue:usb" "usb2-port1" "usb2-port2" "usb3-port1" "usb3-port2"
 	ucidef_set_led_wlan "wlan2g" "WLAN2G" "wndr4700:blue:wlan" "phy0tpt"
 	ucidef_set_led_wlan "wlan5g" "WLAN5G" "wndr4700:blue:wlan" "phy1tpt"

target/linux/apm821xx/nand/config-default

@@ -38,4 +38,6 @@ CONFIG_UBIFS_FS=y
 # CONFIG_UBIFS_FS_ADVANCED_COMPR is not set
 CONFIG_SENSORS_LM90=y
 CONFIG_SENSORS_TC654=y
+CONFIG_SWCONFIG=y
+CONFIG_SWCONFIG_LEDS=y
 CONFIG_WNDR4700=y