[media] v4l: soc-camera: switch to .unlocked_ioctl

Use the V4L mutex infrastructure in soc-camera core and drivers and switch to
.unlocked_ioctl.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
index c143ed0..0268677 100644
--- a/drivers/media/video/pxa_camera.c
+++ b/drivers/media/video/pxa_camera.c
@@ -852,7 +852,7 @@
 	 */
 	videobuf_queue_sg_init(q, &pxa_videobuf_ops, NULL, &pcdev->lock,
 				V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
-				sizeof(struct pxa_buffer), icd, NULL);
+				sizeof(struct pxa_buffer), icd, &icd->video_lock);
 }
 
 static u32 mclk_get_divisor(struct platform_device *pdev,