fix(copyright header): add header to missing files (#2807)

[ROCm/composable_kernel commit: f3239395dc]

script/remove_exec_bit.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+# Copyright © Advanced Micro Devices, Inc., or its affiliates.
+# SPDX-License-Identifier: MIT
 
 for file in $(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(cpp|hpp|txt|inc)$'); do
     if [ -x "$file" ]; then