Adjust `regen-test-files` to match current ART run-test Blueprint files.

License information was recently added to Blueprint files by
large-scale change (LSC)
https://android-review.googlesource.com/c/platform/art/+/1609793. Adjust
script `test/utils/regen-test-files` to generate a `TEST_MAPPING`
output identical to the current file.

Test: Run `art/test/utils/regen-test-files` and check Blueprint files
Bug: 147814778
Change-Id: I91d93bf4bf149d257a1348e65d82e9a7929776e5
1 file changed