turnip: Store the computed iova in the tu_buffer.
We recently had a bug of forgeting to add the buf->bo_offset. Just make the easiest field to get be the bo->iova + buf->bo_offset already. Plus, a little less work at emit time.
We recently had a bug of forgeting to add the buf->bo_offset. Just make the easiest field to get be the bo->iova + buf->bo_offset already. Plus, a little less work at emit time.