KVM: x86: SVM: use vmcb01 in init_vmcb

Clarify that this function is not used to initialize any part of
the vmcb02.  No functional change intended.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>