Imported gamma control configuration from @googyanas repository. Tnx to @googyanas. I feel so lazy :)
Added read_ahead (kb) parameter for internal sd card.
small correction
Merge remote-tracking branch 'upstream/aospv2-4.4' into aospv2-4.4

Conflicts:
	res/customconfig/battery.profile
	res/customconfig/extreme_battery.profile