Like in the previous patches for ath79 and ramips, this will remove
the "devicename" from LED labels in ipq40xx.
The devicename is removed in DTS files and 01_leds, and a migration
script is added. While at it, also harmonize capitalization of
wlan2G/wlan5G vs. wlan2g/wlan5g.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
