This moves WiFi LED triggers from 01_leds to device tree.
While at it, convert the labels there to lower case; this is
more commonly used and the change will actually remove competition
between DT trigger and leftover uci config on already installed
systems.
Suggested-by: Georgi Vlaev <georgi.vlaev@gmail.com>
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>