Remove Intel Xeon Phi

[Armagetron]

I suggest that the Intel Xeon Phi data is removed since this product line is discontinued.

[ax3l]

I think one should keep the product series for historical comparison

[karlrupp]

As long as KNL systems are used for production runs, the data should be kept. Once these systems are decommissioned, we will certainly know whether Xeon Phi has just been an HPC footnote or an important path to something else (e.g. Intel GPUs) ;-)