intel/ci: Fix acer-chromebox-cxi4-puff concurrency

This is a 2-core 2-thread beast with 4GB of RAM.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36348>

src/intel/ci/gitlab-ci-inc.yml

@@ -325,7 +325,7 @@
   variables:
     DEVICE_TYPE: acer-chromebox-cxi4-puff
     FARM: collabora
-    FDO_CI_CONCURRENT: 9
+    FDO_CI_CONCURRENT: 3
     GPU_VERSION: iris-cml
     HWCI_KERNEL_MODULES: i915
     RUNNER_TAG: mesa-ci-x86-64-lava-acer-chromebox-cxi4-puff

src/intel/ci/gitlab-ci.yml

@@ -249,7 +249,6 @@ iris-kbl-traces:
 iris-cml-traces:
   variables:
     GPU_VERSION: intel-cml
-    FDO_CI_CONCURRENT: 6  # Higher leads to OOMs
   extends:
     - .iris-cml-test
     - .iris-traces