USB: Add stream ID field to struct urb.

Bulk endpoint streams were added in the USB 3.0 specification.  Streams
allow a device driver to overload a bulk endpoint so that multiple
transfers can be queued at once.

Add a new field, stream_id, to struct urb so that USB 3.0 drivers can
specify which stream they want the URB to be queued to.
Signed-off-by: NSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

include/linux/usb.h

@@ -1196,6 +1196,7 @@ struct urb {
 	struct usb_device *dev; 	/* (in) pointer to associated device */
 	struct usb_host_endpoint *ep;	/* (internal) pointer to endpoint */
 	unsigned int pipe;		/* (in) pipe information */
+	unsigned int stream_id;		/* (in) stream ID */
 	int status;			/* (return) non-ISO status */
 	unsigned int transfer_flags;	/* (in) URB_SHORT_NOT_OK | ...*/
 	void *transfer_buffer;		/* (in) associated data buffer */