Remove now unneeded fgpautils.h include from avalon.

driver-avalon.c

@@ -36,7 +36,6 @@
 #include "elist.h"
 #include "miner.h"
 #include "usbutils.h"
-#include "fpgautils.h"
 #include "driver-avalon.h"
 #include "hexdump.c"
 #include "util.h"