[media] media: davinci: vpif_capture: use vb2_ops_wait_prepare/finish helper

This patch adds support in the capture driver for using
vb2_ops_wait_prepare/finish()  helpers provided by the
vb2 core.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/davinci/vpif_capture.c

@@ -311,6 +311,8 @@ static struct vb2_ops video_qops = {
 	.start_streaming	= vpif_start_streaming,
 	.stop_streaming		= vpif_stop_streaming,
 	.buf_queue		= vpif_buffer_queue,
+	.wait_prepare		= vb2_ops_wait_prepare,
+	.wait_finish		= vb2_ops_wait_finish,
 };
 
 /**