Add "xpu" to __all__ for torch/version.py (pytorch#149695)

As the title stated.
Pull Request resolved: pytorch#149695
Approved by: https://github.com/desertfire, https://github.com/guangyey

Author: FFFrog

tools/generate_torch_version.py

@@ -97,7 +97,9 @@ def get_torch_version(sha: str | None = None) -> str:
 
     with open(version_path, "w") as f:
         f.write("from typing import Optional\n\n")
-        f.write("__all__ = ['__version__', 'debug', 'cuda', 'git_version', 'hip']\n")
+        f.write(
+            "__all__ = ['__version__', 'debug', 'cuda', 'git_version', 'hip', 'xpu']\n"
+        )
         f.write(f"__version__ = '{version}'\n")
         # NB: This is not 100% accurate, because you could have built the
         # library code with DEBUG, but csrc without DEBUG (in which case