drm/ttm: remove ttm_bo_unmap_virtual_locked declaration v2

That was missed during the cleanup.

v2: fix comment in vmwgfx as well
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/394092/

drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c

@@ -206,7 +206,7 @@ static void vmw_bo_dirty_pre_unmap(struct vmw_buffer_object *vbo,
  * @start: First page of the range within the buffer object.
  * @end: Last page of the range within the buffer object + 1.
  *
- * This is similar to ttm_bo_unmap_virtual_locked() except it takes a subrange.
+ * This is similar to ttm_bo_unmap_virtual() except it takes a subrange.
  */
 void vmw_bo_dirty_unmap(struct vmw_buffer_object *vbo,
 			pgoff_t start, pgoff_t end)

include/drm/ttm/ttm_bo_driver.h

@@ -449,15 +449,6 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
  */
 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
 
-/**
- * ttm_bo_unmap_virtual
- *
- * @bo: tear down the virtual mappings for this BO
- *
- * The caller must take ttm_mem_io_lock before calling this function.
- */
-void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo);
-
 /**
  * ttm_bo_reserve:
  *