ar71xx: vanity changes for dir-825-c1

ar71xx: vanity changes for dir-825-c1

This patch

- changes the color names from orange to amber
- changes the name of GPIO 13 from WIFI_BGN (wifi_bgn) to WLAN_2G
  (wlan2g) to be more consistent with the other routers' files
- changes the descriptions of the hardware keys to be a tad more
  explicit

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
Patchwork: http://patchwork.openwrt.org/patch/4081/
[juhosg: update the LED migration script as well]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38105 3c298f89-4303-0410-b956-a3cf2f4a3e73