Merge "Drop prebuilt files to android source tree." into sc-dev am: 0bddb6bf am: 8758c4c7 am: 15ed65e4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15235240

Change-Id: I6a2fdd07f0948c47771206af9f1e60de4759de22