Staging: wlan-ng: remove duplicated #include

Remove duplicated #include('s) in
  drivers/staging/wlan-ng/p80211wext.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/wlan-ng/p80211wext.c

@@ -49,7 +49,6 @@
 #include <linux/uaccess.h>
 #include <asm/byteorder.h>
 #include <linux/if_ether.h>
-#include <linux/bitops.h>
 
 #include "p80211types.h"
 #include "p80211hdr.h"