media: usbtv: Use the constant for supported standards

Use the USBTV_TV_STD define instead of repeating ourselves.
Signed-off-by: Hugo Grostabussiat <bonstra@bonstra.fr.eu.org>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/usbtv/usbtv-video.c

@@ -670,8 +670,7 @@ static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
 	int ret = -EINVAL;
 	struct usbtv *usbtv = video_drvdata(file);
 
-	if ((norm & V4L2_STD_525_60) || (norm & V4L2_STD_PAL) ||
-			(norm & V4L2_STD_SECAM))
+	if (norm & USBTV_TV_STD)
 		ret = usbtv_select_norm(usbtv, norm);
 
 	return ret;