Revert D24290811: [quant][eagermode] Move custom_module registration to prepare/convert_custom_config_dict
Test Plan: revert-hammer
Differential Revision:
D24290811 (https://github.com/pytorch/pytorch/commit/3ad797c93724d2bc402f85d8f5b57d5661915eaf)
Original commit changeset: 7d2aee98e194
fbshipit-source-id: 24013e92044f2a1b36b1a9f475bbaa6f17bdaa11
