s4-common: commonize several overlay options

- move to common:
   config_defaultNotificationColor
   config_defaultNotificationLedOn
   config_defaultNotificationLedOff
   config_autoBrightnessLevels
   config_autoBrightnessLcdBacklightValues
   config_autoBrightnessButtonBacklightValues
   config_autoBrightnessKeyboardBacklightValues

- match ordering and comments found in config file which is being overlayed

- config_enableLockScreenTranslucentDecor = true is default now

Change-Id: I0b6504b82a162aef8830ea5231f723a72505986b