Remove dead TODO. When multi-signature API support is added, when calling the `GetSubgraphs` api, it will still return all the subgraphs contained in the TF Lite model.
Remove dead TODO. When multi-signature API support is added, when calling the `GetSubgraphs` api, it will still return all the subgraphs contained in the TF Lite model.

PiperOrigin-RevId: 390485454
Change-Id: Ib82ec2af20ca19d2c39b304d5058d246d7334390

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