Support third-party backend for Timm

[Tyx-main]

For Timm supporting third-party backend-NPU, here is a PR opened for compatible.

Note: We can specify a config.yaml as the value of the ‘config’ variable to activate a third-party backend:

dist_backend: hccl 
device_modules: [torch_npu]

[Tyx-main]

cc @rwightman