remove notification led color options for devices with single color led

  due to several comments in forums regarding notification led color options I have added a resource check which is overrideable in device overlays and defaults to true
  this check will remove all color and application configurations and leave only the option to enable / disable the notification led
  to remove the preferences in device overlays set:
    <bool name=config_multiColorNotificationLed>false</bool>

Change-Id: Iccf169a902a69cf8645df757d7d60cec9a0030f6