[dynamo] Get GPU names without calling nvidia-smi (#90474)
Believe it or not, inductor can sometimes be used on machines that
have CUDA GPUs but no nvidia-smi. Let's use torch APIs instead of subprocess.
Differential Revision: [D41841930](https://our.internmc.facebook.com/intern/diff/D41841930/)
Differential Revision: [D41841930](https://our.internmc.facebook.com/intern/diff/D41841930)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/90474
Approved by: https://github.com/voznesenskym, https://github.com/anijain2305
