Serialization for nn.quantized.functional modules (#25220)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25220
Add load_from_state_dict and save_from_state_dict for quantized functional modules
ghstack-source-id: 89070836
Test Plan: buck test mode/dev caffe2/test:quantization -- 'test_scriptability_serialization\ \(test_quantization.ScriptabilityTest\)' --print-passing-details
Differential Revision: D17065243
fbshipit-source-id: 413ce0a95d0c27fedb23894f1483e3da2f60f417
