Provide the option to enable AMD SEV-ES and SEV-SNP

[raja-grewal]

This pull request provides the options to enable two extensions of AMD Secure Encrypted Virtualization (SEV):

• SEV-ES (Encrypted State) extends SEV by encrypting each guests virtual CPU register state during VM exits, and
• SEV-SNP (Secure Nested Paging) extends SEV by activating hardware-level memory integrity.

As per suggested in https://github.com/Kicksecure/security-misc/pull/338#issuecomment-3588000749 by @ArrayBolt3.

Changes

There are no changes to the functionality of the codebase.

Provide the disabled by default options:

kvm_amd.sev_es=1
kvm_amd.sev_snp=1

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