Like in the previous patches for other targets, this will remove
the "devicename" from LED labels in lantiq.
The devicename is removed in DTS files and 01_leds, consolidation
of definitions into DTSI files is done where (easily) possible,
and migration scripts are updated. The DTS/DTSI consolidation is
only performed for files-5.4.
For lantiq,easy98020 some LED definitions have the form
"devicename:function" without the color, so we need to implement
explicit migration for that one.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>