[CI] Skip Running Prmeerge Advisor on AArch64

They were still running because the conditional was not correct. This
patch fixes that so they do not interefere with the results of the job.

Author: boomanaiden154

.github/workflows/premerge.yaml

@@ -57,6 +57,9 @@ jobs:
         # container and non-container jobs.
         shell: bash
     steps:
+      - name: Print platform
+        run: |
+          python3 -c "import platform; print(platform.machine())"
       - name: Checkout LLVM
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with: