[CPUFREQ] dprintf format fixes in cpufreq/speedstep-centrino.c

Ho-hum, did not notice there was more printf fixes for cpufreq (you
should see the amount I have for isdn and reiser ...). Sorry for noise.

Signed-off-by: Mika Kukkonen <mikukkon@gmail.com>
Signed-off-by: Dave Jones <davej@redhat.com>