Merge changes Ic719fcaa,I34999d76,Ia7563394,Id4abe50c,I9e141674, ...

* changes:
  Keystore 2.0: Boot level key: Add missing digest to operation params
  Keystore 2.0: Delete unencrypted boot level keys.
  Keystore 2.0: Add database versioning.
  Keystore 2.0: Move db_utils to database submodule.
  Keystore 2.0: Make key type an explict argument.
  Keystore 2.0: Boot level keys: Check key characteristics.
  Keystore 2.0: Use preferred KM instance for level zero key.
  Keystore 2.0: km_compat: Implement getKeyCharacteristics.