here is a small patch that should address the following issues for 
speedstep on P4M's

1.) detect all P4M's via the model_id string
2.) correctly register drivers on hyperthreading CPU's
3.) do P4-clockmod on top of speedstep on P4-Ms

 since this is my first attempt at kernel programming, it's probably an 
uglu hack. also there is a problem, that the powersave governor does not 
get the lowest frequency correctly. any suggestions/tips are very welcome.

chris