Re-enable test_dag_net_forking on ROCm (#21013)
Summary:
Fixes #16229
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21013
Differential Revision: D15515824
Pulled By: bddppq
fbshipit-source-id: 23a6c7eaad6129328c6b9dfcc55ac2d31a6d2dc0
