Allows Azure's V6 instance outdated SEAM Loader

[ameba23]

This will allow azure's V6 instance outdated SEAM loader when a command line option enables it.

The issues i am currently having with this:

• dcap-qvl does not publicly expose the TCB info related structs. I have copy and pasted them as a workaround, and will make an issue asking them to make them public.
• If we modify anything in the TCB info, the DCAP validation fails because it includes a verification of the signature in the collateral:

called `Result::unwrap()` on an `Err` value: DcapVerification(DcapQvl(Rsa signature is invalid for tcb_info in quote_collateral))

https://github.com/Phala-Network/dcap-qvl/blob/c95e85a5dd47975ad7c56be8afbecb6ef7288330/src/verify.rs#L207-L218

I am not sure why we don't also have this issue in CVM reverse proxy. I don't yet know if there is a workaround we can do for this without making a PR to dcap-qvl (which might be tricky as they are unlikely to want changes which override security checks).

This problem currently does not show up in tests because of the check:

    if tcb_info.fmspc == AZURE_V6_BAD_FMSPC {

which means we don't actually modify anything in the test case. But if i remove that check i get a signature error.