drm/amd/display: Fix vupdate_offload_work doc

commit e9c840d upstream.

Fix the following warning in struct documentation:

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h:168: warning: expecting prototype for struct dm_vupdate_work. Prototype was for struct vupdate_offload_work instead

Fixes: c210b75 ("drm/amd/display: fix dmub access race condition")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Aurabindo Pillai

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -153,7 +153,7 @@ struct idle_workqueue {
 };
 
 /**
- * struct dm_vupdate_work - Work data for periodic action in idle
+ * struct vupdate_offload_work - Work data for offloading task from vupdate handler
  * @work: Kernel work data for the work event
  * @adev: amdgpu_device back pointer
  * @stream: DC stream associated with the crtc