ensure USB config numbers always start from 1

Depending on which features (and thus USB configurations) are included
in the firmware, we need to re-define the ordering of the configuration
numbers, as the Atmel USBD driver simply assumes that configurations are
numbered 1..N without any gaps in the sequence.

firmware/src_simtrace/mode_cardemu.c

@@ -1,4 +1,6 @@
 #include "board.h"
+#include "simtrace.h"
+#include "ringbuffer.h"
 #include "card_emu.h"
 #include "iso7816_fidi.h"
 #include "utils.h"