Enable torch.jit.load for custom device (#99535)
Fixes #ISSUE_NUMBER
1、torch.jit.load for custom device
```
# custom device named `foo`
ts_model = torch.jit.script(mode.to(device="foo"))
ts_model.save("./ts.pt") # it is a script model on device `foo`
# and then we want to load it and run it
torch.jit.load("./ts.pt")
```
2、 add some extra key for custom device with `privateuse1`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99535
Approved by: https://github.com/albanD
