am 16dadf76: Merge "ECIES: implement KM_MODE_CTR. This implementation is rand counter-mode. When encrypting, if the caller doesn\'t specify the IV, Keymaster will randomly generate a 16-byte IV."

* commit '16dadf7622332bb00603b826577a721d7601d33b':
  ECIES: implement KM_MODE_CTR. This implementation is rand counter-mode. When encrypting, if the caller doesn't specify the IV, Keymaster will randomly generate a 16-byte IV.