[Hardware][CPU] using current_platform.is_cpu

[wangshuai09]

FILL IN THE PR DESCRIPTION HERE

Part of the RPC: #9268

Changes:

is_cpu -> current_platform.is_cpu

BEFORE SUBMITTING, PLEASE READ THE CHECKLIST BELOW AND FILL IN THE DESCRIPTION ABOVE

---

PR Checklist (Click to Expand)

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• Use torch.libary.opcheck() to test the function registration and meta-function for any registered ops. See tests/kernels for examples.
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[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.
Just a reminder: PRs would not trigger full CI run by default. Instead, it would only run fastcheck CI which starts running only a small and essential subset of CI tests to quickly catch errors. You can run other CI tests on top of those by going to your fastcheck build on Buildkite UI (linked in the PR checks section) and unblock them. If you do not have permission to unblock, ping simon-mo or khluu to add you in our Buildkite org.

Once the PR is approved and ready to go, your PR reviewer(s) can run CI to test the changes comprehensively before merging.

To run CI, PR reviewers can do one of these:

• Add ready label to the PR
• Enable auto-merge.

🚀

[DarkLight1337]

LGTM, leaving to @youkaichao for final approval

[DarkLight1337]

Please resolve the merge conflicts.

[youkaichao]

thanks for the great work!