fix: symlink ldconfig to ldconfig.real for gpu-operator support

[jeefy]

Currently Nvidia's GPU Operator expects ldconfig.real to exist. See https://github.com/NVIDIA/nvidia-container-toolkit/issues/147 for more info.

Short-term you can modify /usr/local/nvidia/toolkit/.config/nvidia-container-runtime/config.toml to point to /sbin/ldconfig however any time the pods cycle or the node reboots it regenerates the file and points to the incorrect ldconfig.