Backup node's seed in TPM

[samuelmanzanera]

Is your feature request related to a problem?

Since the hybrid root of trust implementation, we are using the software key for nodes while leveraging TPM for origin authorization.
However, in the case we would like to reset a node but not lose the crypto seed (being stored on the node data folder), providing a hardware backup would be great.

Describe the solution you'd like

We can create a new function in the TPM C program, to store the node's seed securely, while loading into memory during the node execution.
At the startup, the node would request the TPM to unwrap the seed.
Hence, the seed would not be lost if the data is removed and rejoining of the network would be easier.

Additional context

No response

[samuelmanzanera]

Closed by #602