programs.nix-required-mounts: presets.cuda -> nvidia-gpu

This hopefully clarifies that the preset configures the hook to expose
"nvidia devices", which includse both the userspace driver and the
device nodes.

The derivations  still declare requiredSystemFeatures = [ "cuda" ] to
explicitly indicate they need to use the CUDA functionality and expect a
libcuda.so and a CUDA-capable device. Ideally, we'd also include the
specific CUDA architectures (sm_86, etc) in feature names.

Derivations that use a co-processor but do not care about the vendor or
even the particular interface may ask for the more generic "opengl",
"vulkan", or "gpu" features. It is then responsibility of the host
declaring the support for this feature to ensure the drivers and
hardware are appropriately set up.

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