From: Hiroshi Miura <miura at da-cha.org>
                                                                                                        
I mistook a Geode chipset's register meanings. (-.-;
ON is not 'CPU is ON' but 'cpu modulation is ON' that is stops cpu.
                                                                                                               
this causes a bad freq setting.
                                                                                                               
This patch fixes this and minor bug that is,
                                                                                                               
        if (new_khz == stock_freq) {  /* if new khz == 100% of CPU speed, it is special case */
                local_irq_save(flags);
                cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
                                                                                                               
cpufreq_notify_transition() called after local_irq_save();
this makes not update cpu_khz.