TEST - Tweak performance and battery life

Enable a certain number of cores based on profile:

Performance:     4 cores
Balanced:        3 cores (default profile)
Powersave:       2 cores

Also dont write values for thermal control when
not necessary.

Change-Id: I24ec5c53e5eec322cf43ff8ff81819ff6fc60db8
Tweak performance and battey life

Performance:    4 cores
Balanced:       3 cores (default profile)
Powersave:      2 cores

Also dont write values for thermal control when
not necessary.