Remove the device plugin and add a mutating admission webhook

[dongx1x]

Previously a device plugin was designed for 2 purposes:

1. Expose the guest device like /dev/tdx_guest to the CCNP service
2. Expose the CCNP service socket to other Pods

now the configfs-tsm was merged in the Linux kernel, we don't need such a device plugin to expose the device to CCNP service, and the socket can be added by a mutating admission webhook, which Kubernetes can manage. A proposal has been submitted to PR #59.