chore: add vLLM SPDX copyright headers to ported files (#25182)

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

test/registered/layers/mamba/test_causal_conv1d.py

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from sglang.test.ci.ci_register import register_amd_ci, register_cuda_ci
 
 register_cuda_ci(est_time=11, suite="stage-b-test-1-gpu-small")

test/registered/layers/mamba/test_mamba2_mixer.py

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 # Adapted from https://github.com/vllm-project/vllm/blob/2c58742dff8613a3bd7496f2008ce927e18d38d1/tests/kernels/mamba/test_mamba_mixer2.py
 
 

test/registered/layers/mamba/test_mamba_ssm.py

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from sglang.test.ci.ci_register import register_amd_ci, register_cuda_ci
 
 register_cuda_ci(est_time=10, suite="stage-b-test-1-gpu-small")

test/registered/layers/mamba/test_mamba_ssm_ssd.py

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 from sglang.test.ci.ci_register import register_amd_ci, register_cuda_ci
 
 register_cuda_ci(est_time=10, suite="stage-b-test-1-gpu-small")