fix: add /usr/lib to library search path in init container

[nmn3m]

Description

This PR fixes an issue where the kubelet-plugin init container fails to detect NVIDIA libraries installed in /usr/lib, causing the pod to remain stuck in Init:0/1 status indefinitely.

Fixes #692

After the fix:

$ kubectl get pods -n nvidia-dra-driver-gpu
NAME                                               READY   STATUS    RESTARTS   AGE
nvidia-dra-driver-gpu-controller-b65d7c4d9-rbr7t   1/1     Running   0          21m
nvidia-dra-driver-gpu-kubelet-plugin-vbjgc         2/2     Running   0          17s

Init container successfully completes:

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[nmn3m]

@klueska @jgehrcke , can you please take a look at this change?