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: b30d5345 am: fbaaae44

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

Change-Id: I7e8a177195cfe7b232fd17d13cff3301de69e210