[ao] qconfig_mapping.py fixing public v private (#87518)
Summary: made _GLOBAL_DICT_KEY, _OBJECT_TYPE_DICT_KEY,
_MODULE_NAME_REGEX_DICT_KEY, _MODULE_NAME_DICT_KEY,
_MODULE_NAME_OBJECT_TYPE_ORDER_DICT_KEY private
Test Plan: python test/test_public_bindings.py
Reviewers:
Subscribers:
Tasks:
Tags:
Differential Revision: [D40709278](https://our.internmc.facebook.com/intern/diff/D40709278)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87518
Approved by: https://github.com/jcaip
