Dont store redundant packed params in dynamic quantized RNN (#38134)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/38134
Test Plan: Imported from OSS
Reviewed By: ailzhang
Differential Revision: D21479289
Pulled By: jamesr66a
fbshipit-source-id: 11d9ad034396ce75c5a93d1f7ebca587205089ee
