Support PRAMIN-based runlist access fallback (optional; on by default)

Using this may be hazardous---we don't know if some of the GPU drivers
use this after initial bring-up. If they do, and we race with them in
setting it, or we unexpectedly change it under them, arbitrary state
corruption could occur.

This is only entirely safe to use if you don't trust the GPU state
after the first use of this fallback. In limited experiments vs the
`nvgpu` (Tegra) and `nvidia` (closed-source discrete) drivers, no
ill side effects have yet been observed, but still please use with
caution.

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