staging: r8712u: Merging Realtek's latest (v2.6.6). Updated include directives.

These are the new include directives for header files.
The following were (somehow!) not explicity in Realtek's, but proved necessary:
"linux/usb.h" is needed for usb_alloc_urb();
"linux/interrupt.h" is needed for tasklet_struct. It was often a nested
include.

Signed-off-by: Ali Bahar <ali@internetDog.org>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/rtl8712/usb_ops_linux.c b/drivers/staging/rtl8712/usb_ops_linux.c
index 54757dd..b796c6b 100644
--- a/drivers/staging/rtl8712/usb_ops_linux.c
+++ b/drivers/staging/rtl8712/usb_ops_linux.c
@@ -28,6 +28,8 @@
 
 #define _HCI_OPS_OS_C_
 
+#include <linux/usb.h>
+
 #include "osdep_service.h"
 #include "drv_types.h"
 #include "osdep_intf.h"