update auditory experiments to new device class format

[JohnGriffiths]

The two auditory experiments in the repo need updating to the new format with the EEG device class

https://github.com/NeuroTechX/eeg-notebooks/tree/master/eegnb/experiments/auditory_ssaep

https://github.com/NeuroTechX/eeg-notebooks/tree/master/eegnb/experiments/auditory_oddball

[JohnGriffiths]

This has been done for some but not all of the auditory experiments. Will complete soon.