[caffe2] remove dnnlowp log code (#33184)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33184
dnnlowp specific code shouldn't be in the default FC in the first place
Test Plan: Just removing #ifdef #endif
Reviewed By: jianyuh
Differential Revision: D19835301
fbshipit-source-id: 7880cf298bedb3f0bc407d140d342124663ea4a7
