Frameworks: Add ability to control default value of DOZE_ENABLED

Devices can enable the doze feature. Devices without AMODLED screens can use it
but it will use then of course more battery. This devices should disable this feature
by default and let the user decide to turn it on.

to change the default behaviour add into device overlay

config_doze_enabled_by_default and set it to false

Change-Id: I1afbf1d09fa0d7e68aea40f2f165a72ff34d0040

Conflicts:
	core/res/res/values/slim_symbols.xml