[reland][quant][eagermode] Move custom_module registration to prepare/convert_custom_config_dict (#46293)

[jerryzh168]

Stack from ghstack:

• [reland][quant][eagermode] Move custom_module registration to prepare/convert_custom_config_dict (#46293) #46364 [reland][quant][eagermode] Move custom_module registration to prepare/convert_custom_config_dict ([quant][eagermode] Move custom_module registration to prepare/convert_custom_config_dict #46293)

Summary:

Test Plan: Imported from OSS

Reviewed By: raghuramank100

Differential Revision: D24322747

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 96f6d85 (more details on the Dr. CI page):

---

• 1/1 failures introduced in this PR---

1 failure not recognized by patterns:

Job	Step	Action
docker-pytorch-linux-xenial-py3-clang5-android-ndk-r19c	Check if image should be built	🔁 rerun

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This comment has been revised 3 times.

[dr-ci]

💊 CI failures summary and remediations

As of commit a930903 (more details on the Dr. CI page):

---

• 1/1 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)---

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This comment has been revised 67 times.

[codecov]

Codecov Report

Merging #46364 into gh/jerryzh168/472/base will decrease coverage by 0.01%.
The diff coverage is 96.29%.

@@                    Coverage Diff                     @@
##           gh/jerryzh168/472/base   #46364      +/-   ##
==========================================================
- Coverage                   68.39%   68.38%   -0.02%     
==========================================================
  Files                         411      410       -1     
  Lines                       53972    53956      -16     
==========================================================
- Hits                        36914    36896      -18     
- Misses                      17058    17060       +2     

[facebook-github-bot]

This pull request has been merged in 30d6875.