[ROCm][Bugfix] Fix ROCm build failure

[vllmellm]

This pull request addresses the compilation error encountered when building the latest vLLM commit on ROCm. The issue arises from the compilation of CUDA-only kernels introduced in commit 90e88ab. Specifically, the error occurs during the compilation of moe_wna16.cu.

Changes:

• Compile moe_wna16_gemm for non-ROCm architectures only.

FIX #14669

[github-actions]

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[tjtanaa]

@DarkLight1337 Please close this PR as it is resolved in #14629

[mergify]

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

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