Irrespective of the zero terms of reference/definition of "White Privilege", it is a subset of 'classism' - [ = is prejudice or discrimination on the basis of social class : and has another subset which includes individual attitudes, behaviors, systems of policies and practices that are set up to benefit the upper class at the expense of the lower class ]
It has probably existed since the dawn of humanity, certainly existed for most of humanities existence and is highly unlikely to ever be removed from humanity the way things are going.