Fix missing data type in flashinfer prefill

[reyoung]

Fix flashinfer prefill.plan bug.

It is similar to PR #8173, but in #8173 , the prefill code is not modified.

cc @pavanimajety @yzh119 @comaniac

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[reyoung]

L366-368 are changed by format.sh when I run it locally.

[hmellor]

Could you provide some more context about the bug?

[github-actions]

This pull request has been automatically marked as stale because it has not had any activity within 90 days. It will be automatically closed if no further activity occurs within 30 days. Leave a comment if you feel this pull request should remain open. Thank you!

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @reyoung.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[github-actions]

This pull request has been automatically marked as stale because it has not had any activity within 90 days. It will be automatically closed if no further activity occurs within 30 days. Leave a comment if you feel this pull request should remain open. Thank you!