[CMake] Move xpu flag to xpu.cmake

[guangyey]

Stack from ghstack (oldest at bottom):

• -> [CMake] Move xpu flag to xpu.cmake #158542

cc @gujinghui @EikanWang @fengyuan14

[pytorch-bot]

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⏳ 1 Pending, 1 Unrelated Failure

As of commit cd1ee92 with merge base 5e149a6 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• xpu / linux-jammy-xpu-2025.1-py3.9 / test (default, 3, 6, linux.idc.xpu) (gh) (similar failure)
  test_testing.py::TestImports::test_circular_dependencies

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[ezyang]

@pytorchbot merge

[pytorchmergebot]

Merge failed

Reason: Approvers from one of the following sets are needed:

• superuser (pytorch/metamates)
• Core Reviewers (mruberry, lezcano, Skylion007, ngimel, peterbell10, ...)
• Core Maintainers (soumith, gchanan, ezyang, dzhulgakov, malfet, ...)

Details for Dev Infra team

Raised by workflow job

Failing merge rule: Core Maintainers

[guangyey]

@ezyang, this PR requires final approval from the PyTorch Maintainer. May I know if you have any comments?

[ezyang]

@pytorchbot merge

[pytorchmergebot]

Merge started

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[guangyey]

Thanks very much~