Merge "Drop prebuilt files to android source tree." into sc-dev am: caa1a4f3...

Merge "Drop prebuilt files to android source tree." into sc-dev am: caa1a4f3 am: 251e9a95 am: 24de23e0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15301450

Change-Id: If64d6bef3984b44a88e94715e3a9fa376daa9a43