Move the logic for populating default calibration options to `PopulateDefaults`.
Move the logic for populating default calibration options to `PopulateDefaults`.

This change populates calibration method as part of `PopulateDefaults`. This is reused for ODML use cases. However, for ODML the value for `unpack_quantized_types` is explicitly set to `False` because ODML use cases require uniform quantized types to be left intact.
