prod/Makefile (ben): used simplified setup with only one atben and one atusb
prod/Makefile (ben): used simplified setup with only one atben and one atusb

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan