kubelet plugin: move MASK_NVIDIA_DRIVER_PARAMS into code

[jgehrcke]

This is about

k8s-dra-driver-gpu/deployments/helm/nvidia-dra-driver-gpu/templates/kubeletplugin.yaml

Line 123 in bf444c4

if [ "${MASK_NVIDIA_DRIVER_PARAMS}" = "true" ]; then

and

k8s-dra-driver-gpu/deployments/helm/nvidia-dra-driver-gpu/templates/kubeletplugin.yaml

Line 65 in bf444c4

if [ "${MASK_NVIDIA_DRIVER_PARAMS}" = "true" ]; then

@klueska originally said

Currently we have the logic to mask /proc/driver/nvidia/params directly in command arguments of the helm template for the kubelet plugin. We should instead do this in the code for plugin as part of its initialization.