Add system dell/xps/15-9500#178

Merged

Mic92 merged 5 commits intoNixOS:masterfrom

bahaynes:master

Jul 30, 2020

Commits on Jul 23, 2020

Added dell xps 15-9500, with nvidia gpu.
bahaynes
committed

Commits on Jul 26, 2020

Moved NVIDIA config to common, and updated README.
bahaynes
committed

Commits on Jul 27, 2020

Commits on Jul 30, 2020

Removed tlp configuration.
bahaynes
committed