- usb/usb.c: moved chip-specific functions to usb/atu2.c
- Makefile (USB_OBJS): added usb/atu2.c
- usb/usb.h, usb/usb.c, ep0.c: made argument to my_setup and user_setup
"const"
- usb/ubs.h (handle_setup): call from chip driver to generic stack
- usb/ubs.h (set_addr): call from generic stack to chip driver
