ar71xx: add default LED configuration for the WL-WRD3500

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36120 3c298f89-4303-0410-b956-a3cf2f4a3e73

Conflicts:
	target/linux/ar71xx/base-files/etc/uci-defaults/01_leds