[Misc] Add SPDX-FileCopyrightText (#19100)

Signed-off-by: simon-mo <simon.mo@hey.com>

tests/models/multimodal/generation/vlm_utils/model_utils.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Common utility functions relating to different models that are useful
 for manipulating the input / output of HF & vLLM test runners, which are
 typically specific to a small subset of models.