media: atomisp: Remove unused lock member from struct atomisp_sub_device

The spin-lock embedded in struct atomisp_sub_device is not used anywhere,
remove it.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_subdev.c

@@ -1356,7 +1356,6 @@ int atomisp_subdev_init(struct atomisp_device *isp)
 		return -ENOMEM;
 	for (i = 0; i < isp->num_of_streams; i++) {
 		asd = &isp->asd[i];
-		spin_lock_init(&asd->lock);
 		asd->isp = isp;
 		isp_subdev_init_params(asd);
 		asd->index = i;

drivers/staging/media/atomisp/pci/atomisp_subdev.h

@@ -272,7 +272,6 @@ struct atomisp_sub_device {
 	/* video pipe main output */
 	struct atomisp_video_pipe video_out_video_capture;
 	/* struct isp_subdev_params params; */
-	spinlock_t lock;
 	struct atomisp_device *isp;
 	struct v4l2_ctrl_handler ctrl_handler;
 	struct v4l2_ctrl *fmt_auto;