We currently have 4 different places where we have the logic for
modifying LED state of the various types of Ambient LEDs,
ExternalNotificationModule::SetExternalOff
ExternalNotificationModule::SetExternalOn
AmbientLightingThread::setLighting
AmbientLightingThread::setLightingOff
This patch de-duplicates the methods in ExternalNotification to
a single method, using a boolean to toggle whether we're turning
things on or off.