Fix sublayer names of `RandomFeatureGaussianProcess`.
Fix sublayer names of `RandomFeatureGaussianProcess`.

This change freeze the names of `RandomFeatureGaussianProcess`'s sublayers to prevent them from receiving arbitrary names during graph creation. This is important for custom model loading in graph-mode (e.g., for model distillation).

PiperOrigin-RevId: 345262729

google/edward2