[ROCm] Enable bf16-related tests in test_c10d_nccl.py and test_grad_layout_1devicemodule_1replicaperprocess (#82020)
### Description
Enable bf16-related unit tests in test_c10d_nccl.py and test_grad_layout_1devicemodule_1replicaperprocess as follows:
- distributed/test_c10d_nccl test_bf16_compress_wrapper_is_view (main.DistributedDataParallelTest)
- distributed/test_c10d_nccl test_bf16_compress_wrapper_nccl (main.DistributedDataParallelTest)
- distributed/test_c10d_nccl test_grad_layout_1devicemodule_1replicaperprocess (main.DistributedDataParallelTest)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82020
Approved by: https://github.com/ezyang