Add back backlight curve adjustment.

PS2:Fixed ok string, moved AutoBrightnessCustomizeDialog.java out of CM folder
PS3:Fixed minor derp

Change-Id: I4f55091c5d8c72301c0985fa8463d198f86a7d21
Signed-off-by: kecinzer <kecinzer@gmail.com>

Conflicts:

	res/layout/auto_brightness_list_item.xml
	res/layout/dialog_auto_brightness_levels.xml
	res/values/strings.xml
	src/com/android/settings/BrightnessPreference.java