[quant][graphmode][fx] Add support for packed params in state_dict (#51639)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51639
Test Plan: Imported from OSS
Reviewed By: z-a-f
Differential Revision: D26228185
fbshipit-source-id: 6cf8b4106fec9c6900521a2afe0de6f3d29cc896
