[MPS] Add support for scaled_modified_bessel_k1 to eager.

[dcci]

Another day another op

cc @kulinseth @albanD @malfet @DenisVieriu97 @jhavukainen

[pytorch-bot]

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As of commit 199eb5f with merge base bdc132d ():
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[github-actions]

Attention! native_functions.yaml was changed

If you are adding a new function or defaulted argument to native_functions.yaml, you cannot use it from pre-existing Python frontend code until our FC window passes (two weeks). Split your PR into two PRs, one which adds the new C++ functionality, and one that makes use of it from Python, and land them two weeks apart. See https://github.com/pytorch/pytorch/wiki/PyTorch's-Python-Frontend-Backward-and-Forward-Compatibility-Policy#forwards-compatibility-fc for more info.

---

Caused by:

• aten/src/ATen/native/native_functions.yaml

[dcci]

@pytorchbot merge -f "mps tests + lint are green"

[pytorchmergebot]

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