[c2] Remove unused private fields (#69709)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69709
Fix logical bug in `caffe2/ideep/operators/conv_op.cc`, which
contained an always false statement (fusion_type_ == X && fusion_type_ == Y ) statement
Test Plan: Imported from OSS
Reviewed By: r-barnes
Differential Revision: D32997006
Pulled By: malfet
fbshipit-source-id: 23e4db1b17cf8a77eae6a8691847ffa484d4736c
