The dependencies do not work for DT overlays and DT merge. As a hack
fix, always run the rules for DT overlays and merge.

As this causes the dtb-merge to be run for every build, even if nothing
changed, remove the print from dtb-merge script to hide the confusion.

Signed-off-by: Tomi Valkeinen <[email protected]>
Acked-by: Tero Kristo <[email protected]>
Signed-off-by: Suman Anna <[email protected]>