Revert "Add __init__.pyi to torch/linalg (pytorch#160750)"

This reverts commit 9a665ca.

Reverted pytorch#160750 on behalf of https://github.com/jeanschmidt due to Seems that those errors are legitimate, and there is no test plan. I'll be proceeding with a revert ([comment](pytorch#160750 (comment)))

Author: pytorchmergebot

test/typing/reveal/namedtuple.py

@@ -12,5 +12,5 @@
 t_qr = torch.linalg.qr(t)
 t_qr[0].shape == [2, 2]  # noqa: B015
 t_qr.Q.shape == [2, 2]  # noqa: B015
-# Fixed: Now properly typed as torch.return_types.qr thanks to stub file
-reveal_type(t_qr)  # E: torch.return_types.qr
+# TODO: Fixme, should be Tuple[{Tensor}, {Tensor}, fallback=torch.return_types.qr]
+reveal_type(t_qr)  # E: Any