ar71xx: Fix LED definitions for the DRAGINO2 board

This patch fixes LED definitions for the DRAGINO2 board.

1. It renames the Router/USB led to System, as it is now marked "SYS" on the board.
2. It gives control of the LAN and WAN leds and some other GPIOs to Linux.
3. It fixes the active_low property for the LAN and WAN leds.
4. It sets up WLAN, LAN and WAN leds in the UCI defaults.
5. It allows usage of the System led by the diag.sh script, so it will be used to indicate boot and failsafe status.

Signed-off-by: Vittorio Gambaletta <openwrt@vittgam.net>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42897 3c298f89-4303-0410-b956-a3cf2f4a3e73

ar71xx: add kernel support for DRAGINO2

This patch adds support for DRAGINO2 board (used by
Meshpotato v2). Most of the files included can be
found in the official svn repository provided by the
company [1]. I have just adapt it to the last OpenWrt
trunk revision (Fri Oct 4 10:49:47 2013).

1. http://svn.dragino.com/dragino2

Patchwork: http://patchwork.openwrt.org/patch/4234/
Signed-off-by: Pau Escrich <p4u@dabax.net>
[juhosg:
- rename and refresh kernel patch,
- fix checkpatch warnings in mach-dragino2.c]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38587 3c298f89-4303-0410-b956-a3cf2f4a3e73