Remove CDI device-list-strategy from device plugin

CDI annotations require NVML validation that fails on NixOS. Use the
default envvar strategy for the device plugin — CDI device injection
still works at the containerd level via enable_cdi=true.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

argocd/manifests/nvidia-device-plugin/daemonset.yaml

@@ -24,10 +24,6 @@ spec:
         - name: nvidia-device-plugin
           image: nvcr.io/nvidia/k8s-device-plugin:v0.18.2
           env:
-            - name: DEVICE_LIST_STRATEGY
-              value: cdi-annotations
-            - name: CDI_ROOT
-              value: /var/run/cdi
             - name: LD_LIBRARY_PATH
               value: /run/nvidia/lib
           securityContext: