svm: Updated cr4 in test_efer to fix report msg

Updated cr4 so that cr4 and vmcb->save.cr4 are the same
and the report statement prints out the correct cr4.

Signed-off-by: Lara Lazier <laramglazier@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210621153925.31375-1-laramglazier@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>