Remove "P2 forced" state from drivers

Why every running CUDA programs force the GPU to P2 state. It’s really annoying:

  • There is no way to disable that behavior. (no NVreg_* options in nvidia kernel module).
  • It prevents power saving when decoding with NVDEC (GPU clock doesn’t decrease bellow base clock).
  • It reduces GPU performance of CUDA programs and games during encoding sessions.

There are topics from 2017/2018 complaining about that:

A least add an option such as kernel parameters to disable “P2 forced” state when running CUDA.