They have been removed from NixOS. The "hardware.opengl" group is now
renamed to "hardware.graphics".
See: 98cef4c273
Reviewed-by: Aleix Boné <abonerib@bsc.es>
To accomodate the raccoon knights workstation, some of the configuration
pulled by m/common/main.nix has to be removed. To solve it, the xeon
specific parts are placed into m/common/xeon.nix and only the common
configuration is at m/common/base.nix.
Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>
