blu_active: use cal_freq, remove target_loads

Signed-off-by: Stefanescu Cristian <howerkraft@gmail.com>
blu_active: add down load threashold to keep cal_freq better on low loads
thanks to franciscofranco

Signed-off-by: Stefanescu Cristian <howerkraft@gmail.com>
blu_active: use get_cpu_idle_time_cb

Signed-off-by: Stefanescu Cristian <howerkraft@gmail.com>

Conflicts:
	drivers/cpufreq/cpufreq_blu_active.c