[quant][embdding qat] Add FX support for QAT EmbeddingBag (#68121)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68121
Add FX support for QAT EmbeddingBag operator, previously only eager mode support.
Test Plan:
pytest test/quantization/fx/test_quantize_fx.py -v -k "test_qat_embeddingbag_linear"
Imported from OSS
Reviewed By: supriyar
Differential Revision: D32318435
fbshipit-source-id: 8b5d1a5d5422972c49676f9e470d5fbe29dd503b
