[ao][fx] fixing public v private for pattern_utils.py (#88397)
Summary: made _DEFAULT_FUSION_PATTERNS,
_register_fusion_pattern,
_DEFAULT_QUANTIZATION_PATTERNS,
_DEFAULT_OUTPUT_FAKE_QUANTIZE_MAP,
_DEFAULT_OUTPUT_OBSERVER_MAP,
_register_quant_pattern,
_sorted_patterns_dict private
Test Plan: python test/test_public_bindings.py
Reviewers:
Subscribers:
Tasks:
Tags:
Differential Revision: [D41015537](https://our.internmc.facebook.com/intern/diff/D41015537)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88397
Approved by: https://github.com/jcaip
