Merge "Add license headers" am: 3bca6cc235 am: da52b883de am: 66667fc761 am: 53ea604270 am: 032be165c5

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

Change-Id: Id89ba8cafddce681a825ed0df7b99725e1b5dfe4