chore(nodeadm): add p5en to NVIDIA nstance type families

[mattcjo]

Description of changes: New instance type, P5en, is currently missing from the containerd runtime config. This PR adds P5en to the list of supported instances.

Current /etc/containerd/config.toml:

sh-4.2$ cat config.toml

imports = ["/etc/containerd/config.d/*.toml"]
root = "/var/lib/containerd"
state = "/run/containerd"
version = 2

[grpc]
  address = "/run/containerd/containerd.sock"

[plugins]

  [plugins."io.containerd.grpc.v1.cri"]
    sandbox_image = "602401143452.dkr.ecr.us-east-2.amazonaws.com/eks/pause:3.5"

    [plugins."io.containerd.grpc.v1.cri".cni]
      bin_dir = "/opt/cni/bin"
      conf_dir = "/etc/cni/net.d"

    [plugins."io.containerd.grpc.v1.cri".containerd]
      default_runtime_name = "nvidia"
      discard_unpacked_layers = true

      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes]

        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.nvidia]
          runtime_type = "io.containerd.runc.v2"

          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.nvidia.options]
            BinaryName = "/usr/bin/nvidia-container-runtime"
            SystemdCgroup = true

        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
          runtime_type = "io.containerd.runc.v2"

          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
            SystemdCgroup = true

    [plugins."io.containerd.grpc.v1.cri".registry]
      config_path = "/etc/containerd/certs.d:/etc/docker/certs.d"

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