The rfe instruction has been broken since patch
5a839c0d54fac9db0516904db873a4fe01f50f4b because of a typo.
Signed-off-by: Peter Chubb <peter.chubb@nicta.com.au>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>