[2/2] settings: add CPU info overlay

this shows
CPU temp (if available)
for every core governor + online + freq

Change-Id: I28c1e48c2e613b33c301b61cead70678ab6a2e9b
settings: embed custom led notifications into display

Thats how I would do it :)
I have just commented out the original code

Change-Id: Id68074f79967167a892b51796ca10a3a2359dceb
Settings: notification lights - fix for devices without leds

On devices that don't have notification leds, the preference
should be hidden in display settings. I adapted the commented
code for the new PreferenceScreen and removed unneeded commented
parts. Now the value of config_intrusiveNotificationLed is checked
and the preference is displayed accordingly.

Change-Id: Ia7834d1f415928d566b1ab8bc93c361c738487f2