ramips: fix LED labels not updated during device name changes
In commit
d93969a13a5b ("ramips: Improve compatible for TP-Link
Archer devices") and subsequent ones, names of several devices
in ramips have been changed.
Since LED names are frequently invoked by $boardname, this has
broken LED setup in 01_leds, as $boardname and prefix in DTS
do not match anymore.
This patch updates device name prefixes for LEDs in DTS files,
and provides a migration script.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>