vop: sparse warning fixup

vop_dc_to_vdev dropped an __iomem tag on its argument,
causing a sparse warning. Fix it up.

Signed-off-by: Michael S. Tsirkin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/mic/vop/vop_main.c

···
 	return vdev->desc == (void __iomem *)data;
 }
 
-static struct _vop_vdev *vop_dc_to_vdev(struct mic_device_ctrl *dc)
+static struct _vop_vdev *vop_dc_to_vdev(struct mic_device_ctrl __iomem *dc)
 {
 	return (struct _vop_vdev *)(unsigned long)readq(&dc->vdev);
 }