drm/vmwgfx: Fix Legacy Display Unit

Legacy DU was broken by the referenced fixes commit because the placement
and the busy_placement no longer pointed to the same object. This was later
fixed indirectly by commit a78a8da5
("drm/ttm: replace busy placement with flags v6") in v6.9.

Fixes: 39985eea ("drm/vmwgfx: Abstract placement selection")
Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>
Cc: <stable@vger.kernel.org> # v6.4+
Reviewed-by: Zack Rusin <zack.rusin@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240425200700.24403-1-ian.forbes@broadcom.com

drivers/gpu/drm/vmwgfx/vmwgfx_bo.c

@@ -204,6 +204,7 @@ int vmw_bo_pin_in_start_of_vram(struct vmw_private *dev_priv,
 			     VMW_BO_DOMAIN_VRAM,
 			     VMW_BO_DOMAIN_VRAM);
 	buf->places[0].lpfn = PFN_UP(bo->resource->size);
+	buf->busy_places[0].lpfn = PFN_UP(bo->resource->size);
 	ret = ttm_bo_validate(bo, &buf->placement, &ctx);
 
 	/* For some reason we didn't end up at the start of vram */