auav-x21: Upstream NuttX reloaction of can.h

can.h was moved in upstream NuttX from nuttx/drivers/can.h
   to nuttx/include/nuttx/can/can.h

src/drivers/boards/auav-x21/auav_can.c

@@ -46,7 +46,7 @@
 #include <errno.h>
 #include <debug.h>
 
-#include <nuttx/drivers/can.h>
+#include <nuttx/can/can.h>
 #include <arch/board/board.h>
 
 #include "chip.h"