ar71xx: fix RB750 LED configuration

Patch-by: Ray Bellis

SVN-Revision: 21826

target/linux/ar71xx/base-files/etc/uci-defaults/rb750

@@ -18,9 +18,9 @@ set system.led_port1.name='port1'
 set system.led_port1.sysfs='rb750:green:port1'
 set system.led_port1.trigger='netdev'
 set system.led_port1.dev=eth1
-set system.led_port1.mode='tx rx'
+set system.led_port1.mode='link tx rx'
 set system.led_port2='led'
-set system.led_port2.name='port3'
+set system.led_port2.name='port2'
 set system.led_port2.sysfs='rb750:green:port2'
 set system.led_port2.trigger='netdev'
 set system.led_port2.dev=port2