This makes Android Keystore's Cipher implementation use a custom
implementation of engineUpdate(ByteBuffer, ByteBuffer) and
engineDoFinal(ByteBuffer, ByteBuffer). The implementation is
explicitly designed around the fact that Android Keystore transmits
input and receives output via Binder and thus there's no need to
attempt any optimizations to avoid copying input and output.
Bug: 25863382
Change-Id: I311072891f02f5e7a283628b51b8d6058b55231c
d976c5a4ee