[media] v4l: Convert drivers to use monotonic timestamps

Convert drivers using wall clock time (CLOCK_REALTIME) to timestamp from the
monotonic timer (CLOCK_MONOTONIC).

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/usb/tm6000/tm6000-video.c b/drivers/media/usb/tm6000/tm6000-video.c
index 1edc251..e3c567c 100644
--- a/drivers/media/usb/tm6000/tm6000-video.c
+++ b/drivers/media/usb/tm6000/tm6000-video.c
@@ -194,7 +194,7 @@
 	dprintk(dev, V4L2_DEBUG_ISOC, "[%p/%d] wakeup\n", buf, buf->vb.i);
 	buf->vb.state = VIDEOBUF_DONE;
 	buf->vb.field_count++;
-	do_gettimeofday(&buf->vb.ts);
+	v4l2_get_timestamp(&buf->vb.ts);
 
 	list_del(&buf->vb.queue);
 	wake_up(&buf->vb.done);