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/hal_init.c b/drivers/staging/rtl8712/hal_init.c
index 1411c7bf..1bd9c37 100644
--- a/drivers/staging/rtl8712/hal_init.c
+++ b/drivers/staging/rtl8712/hal_init.c
@@ -28,6 +28,11 @@
 
 #define _HAL_INIT_C_
 
+#include <linux/usb.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/firmware.h>
+
 #include "osdep_service.h"
 #include "drv_types.h"
 #include "rtl871x_byteorder.h"