fix for #233 (Unable to unlock root partition with tpm2 key)

[avktech78]

No description provided.

[anatol]

Thank you for the change! TPM2 support is very much welcome.

One thing that I would really love to see is having a good integration test for this functionality. Could you please describe the sequence of steps to reproduce the original issue, so I can codify it as a test case.

[avktech78]

The thing is, I've never programmed in Go, but I really missed having this feature. At first, I used a separate old version of systemd-cryptenroll. But at some point, I decided to try updating your code to support tpm2_srk.
So I used ChatGPT for that. At the time of publication, I still remembered the details, but now I can hardly remember anything.
I'm sorry, I understand that it's important for a developer to have a well-tested product, but all I can say is that this patch works on my computer.