KVM: SVM: Update SEV-ES shutdown intercepts with more metadata

Currently if an SEV-ES VM shuts down userspace sees KVM_RUN struct with
only errno=EINVAL. This is a very limited amount of information to debug
the situation. Instead return KVM_EXIT_SHUTDOWN to alert userspace the VM
is shutting down and is not usable any further.

Signed-off-by: Peter Gonda <[email protected]>
Suggested-by: Sean Christopherson <[email protected]>
Suggested-by: Tom Lendacky <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Tom Lendacky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[sean: tweak changelog]
Signed-off-by: Sean Christopherson <[email protected]>

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