Some headers makes use of slists w/o including sys/slist.h Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Until now the whole USB device stack code is located in the top subsys/usb directory. Move it to own directory in preparation for upcoming extension and rework of USB support. Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>