gpu: Add new step to go to 657500000

Signed-off-by: dragon <dragon7780@hotmail.nl>
Add 657500 step to possible gpu boost values
More booster tweaks
devfreq: Re-enable simple_ondemand.   Also fix simple_ondemand crashing from GuneetAtwal
NF6 source drop

Signed-off-by: dragon <dragon7780@hotmail.nl>