KVM: x86: SVM: use smram structs

Use SMM structs in the SVM code as well, which removes the last user of
put_smstate/GET_SMSTATE so remove these macros as well.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221025124741.228045-22-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>