Sort out audiably noisy POE transformer at low power loads

[Tyler-Ward]

The POE transofrmer is noisy at low loads (high pitched coil whine). Initial builds used a missordered POE13P-12L rather than the POE70P-12L so using the correct transformer may fix it, if not other methods may be needed to reduce the audible noise

[Tyler-Ward]

With the POE70P the noise remains untill 4 510 ohm load resistances were added to the board, this is better than before but does cause some heat as a result.