NXP Backend: Add missing copyright and license info

Author: jirioc

backends/nxp/tests/ir/converter/node_converter/test_adaptive_avg_pool2d_converter.py

@@ -1,3 +1,8 @@
+# Copyright 2025 NXP
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
 import numpy as np
 import pytest
 import torch