cpufreq: interactive: stop unnecessary freq jumps

 * Adjust tunables to avoid freq jumps from 300 Mhz to 1 Ghz

 * Delete suspend logic to raise lock to 600 Mhz (this will
   lock the freq to the desired value without using any higher
   freq).

 * Also another safety patch to avoid null pointers

Signed-off-by: Blechd0se <alex.christ@hotmail.de>