KVM: selftests: Add a test to verify SEV {en,de}crypt debug ioctls

Add a selftest to verify KVM's handling of {de,en}crypt debug ioctls,
specifically focusing on edge cases around the chunk (16 bytes) and page
(4096) sizes, where KVM had multiple bugs.  E.g. KVM would fail to handle
small sizes that aren't naturally aligned and sized, would buffer overflow
if the destination was unaligned but the source was not, etc.

Attempt to strike a balance between an exhaustive test and a reasonable
runtime.  On a system with both SEV and SEV-ES support, the current runtime
is under 45 seconds.  Which isn't great, but it's tolerable, and it's not
obvious which of the combinations are "better" than the others.

Link: https://patch.msgid.link/20260501203537.2120074-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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