ar71xx: fix LAN LEDs for dir-825-c1

This patches fixes the lan led configuration. The new configuration is
identical to the one in mach-db120.c and it works. The previous one
didn't work at all.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38094 3c298f89-4303-0410-b956-a3cf2f4a3e73