[RenderScript] Add arm64 prebuilts to BuildTools am: 4d6b8c48b6 am: c01d0fc70e am: 356d779616 am: b82c47c128
am: 75b8fb738f

* commit '75b8fb738fec3fc3e740ca791c58c7c8fd8b2017':
  [RenderScript] Add arm64 prebuilts to BuildTools