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
diff --git a/test/utils/regen-test-files b/test/utils/regen-test-files
index db00067..1f48aad 100755
--- a/test/utils/regen-test-files
+++ b/test/utils/regen-test-files
@@ -491,6 +491,15 @@
       // Build rules for ART run-test `{run_test}`.
 
       // Test's Dex code.
+      package {{
+          // See: http://go/android-license-faq
+          // A large-scale-change added 'default_applicable_licenses' to import
+          // all of the 'license_kinds' from "art_license"
+          // to get the below license kinds:
+          //   SPDX-license-identifier-Apache-2.0
+          default_applicable_licenses: ["art_license"],
+      }}
+
       java_test {{
           name: "{run_test_module_name}",
           defaults: ["art-run-test-defaults"],