fix: remove duplicate devicePlugin entry in gpu-operator config

Jack Charlie Mundayrequested to merge
fix-dup-device-plugin-config into master

Closes #120 (closed).

See [values.yaml:L130](https://gitlab.cern.ch/kubernetes/automation/releases/cern-magnum/-/blob/master/values.yaml#L130) for config that is currently being used by gpu operator (the section being deleted is what is getting overridden by this).

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