[quant][graph] Add check for qconfig_dict key (#37014)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37014
User should only pass name as key in dict.
Test Plan: Imported from OSS
Differential Revision: D21283696
fbshipit-source-id: e6babbe9302c812d6ae03ed7f843d2816b752e78
