[RenderScript] Unhide new Allocation APIs

Bug: 23535524

  - ByteBuffer getByteBuffer()
  - long getStride()
  - Allocation[] createAllocations(rs, type, usage, num)
  - long getTimeStamp()

Change-Id: I0cad88c81f9f48c7aca59af159c49f506b234aee
4 files changed