Merge "Add license headers" am: 3bca6cc235 am: da52b883de am: 66667fc761 am: 53ea604270

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1394894

Change-Id: I60c4b3d44ad8d0b14d0a446aba7269c44fc46311