[cpu][fix] Fix Arm CI tests

[fadara01]

Purpose

• Remove numa related configs from Arm CI tests: our self-hosted runners don't have numactl installed and are single numa anyways
• Remove --privileged because our agents don't support that and we don't need it
• Replace llama3.2-3b in serving test with qwen3-0.6b, because llama is gated and we don't yet set a HF_TOKEN.

Test Plan

Trigger a build with Arm pipeline introduced in https://github.com/vllm-project/ci-infra

Test Result

Build passes, see: https://buildkite.com/vllm/ci/builds/40820/steps/canvas?sid=019ac288-2547-45d5-b974-0cb7796cf26b

Tests Pass

---

Essential Elements of an Effective PR Description Checklist

• [Y] The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• [Y] The test plan, such as providing test command.
• [Y] The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[gemini-code-assist]

Code Review

This pull request removes NUMA-related configurations from the ARM CI test script, which is appropriate since the self-hosted runners do not have numactl and are single-NUMA. The changes are mostly correct and simplify the script. However, I've found a minor issue in how the test function is called, which should be corrected for clarity and robustness.

[fadara01]

@bigPYJ1151 @mgoin could you review this please?