staging: wfx: remove useless include

hif_tx.c does not use any struct skb.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191217161318.31402-19-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/hif_tx.c

@@ -6,7 +6,6 @@
  * Copyright (c) 2017-2019, Silicon Laboratories, Inc.
  * Copyright (c) 2010, ST-Ericsson
  */
-#include <linux/skbuff.h>
 #include <linux/etherdevice.h>
 
 #include "hif_tx.h"