If cpufreq_register_notifier is called before pure initcalls,
init_cpufreq_transition_notifier_list will overwrite whatever it did,
causing notifiers to be ignored.

Print some noise to the kernel log if that happens.
Signed-off-by: NCesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: NDave Jones <davej@codemonkey.org.uk>