[quant][mobile] Don't release bias tensor (#38284)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38284
Bias is used to calculate out channels
Test Plan: Imported from OSS
Differential Revision: D21515997
fbshipit-source-id: 5fe5ddd4c7ce5cc49d15c477b744994a3db5fc89
