Added interrupt polling support for atusb.

- atrf/fw/include/atspi/ep0.h enum atspi_requests), atrf/fw/atspi/ep0.c
  (my_setup): new command ATSPI_POLL_INT to poll IRQ_RF
- atrf/fw/atspi/ep0.c (my_setup): ATSPI_BUILD sent one byte too many
- tools/lib/atusb.c (atusd_interrupt, atusb_driver): implemented interrupt
  polling
- tools/lib/atusd.c: added section title for the RF interrupt function

tools/lib/atusd.c

@@ -300,6 +300,9 @@ static int atusd_buf_read(void *handle, void *buf, int size)
 }
 
 
+/* ----- RF interrupt ------------------------------------------------------ */
+
+
 static int atusd_interrupt(void *handle)
 {
         struct atusd_dsc *dsc = handle;