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A per-device calibration transform matrix that maps from the reference sensor colorspace to the actual device sensor colorspace (this is the colorspace of the raw buffer data).
This matrix is used to correct for per-device variations in the sensor colorspace, and is used for processing raw buffer data.
The matrix is expressed as a 3x3 matrix in row-major-order, and contains a per-device calibration transform that maps colors from reference sensor color space (i.e. the "golden module" colorspace) into this camera device's native sensor color space under the second reference illuminant (CameraCharacteristics.SensorReferenceIlluminant2).
This matrix will only be present if the second reference illuminant is present.
Optional - This value may be null on some devices.