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docs: add runtime measurement table for Constellation v2.16 (#2979)

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docs/versioned_docs/version-2.16/architecture/attestation.md
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@ -217,6 +217,38 @@ The latter means that the value can be generated offline and compared to the one
| 15 | ClusterID | Constellation Bootstrapper | Yes |
| 16–23 | Unused | - | - |
</tabItem>
<tabItem value="stackit" label="STACKIT">
Constellation uses a hypervisor-based vTPM for runtime measurements.
The vTPM adheres to the [TPM 2.0](https://trustedcomputinggroup.org/resource/tpm-library-specification/) specification.
The VMs are attested by obtaining signed PCR values over the VM's boot configuration from the TPM and comparing them to a known, good state (measured boot).
The following table lists all PCR values of the vTPM and the measured components.
It also lists what components of the boot chain did the measurements and if the value is reproducible and verifiable.
The latter means that the value can be generated offline and compared to the one in the vTPM.
| PCR | Components | Measured by | Reproducible and verifiable |
| ----------- | ---------------------------------------------------------------- | -------------------------------------- | --------------------------- |
| 0 | Firmware | STACKIT | No |
| 1 | Firmware | STACKIT | No |
| 2 | Firmware | STACKIT | No |
| 3 | Firmware | STACKIT | No |
| 4 | Constellation Bootloader, Kernel, initramfs, Kernel command line | STACKIT, Constellation Bootloader | Yes |
| 5 | Firmware | STACKIT | No |
| 6 | Firmware | STACKIT | No |
| 7 | Secure Boot Policy | STACKIT, Constellation Bootloader | No |
| 8 | - | - | - |
| 9 | initramfs, Kernel command line | Linux Kernel | Yes |
| 10 | User space | Linux IMA | No[^1] |
| 11 | Unified Kernel Image components | Constellation Bootloader | Yes |
| 12 | Reserved | (User space, Constellation Bootloader) | Yes |
| 13 | Reserved | (Constellation Bootloader) | Yes |
| 14 | Secure Boot State | Constellation Bootloader | No |
| 15 | ClusterID | Constellation Bootstrapper | Yes |
| 16&ndash;23 | Unused | - | - |
</tabItem>
</tabs>