Support for exposing information to `hwmon`

[ThatOneCalculator]

This will allow tools like https://github.com/nokyan/resources to fully display usage statistics for the NPU, useful for when it's under load.

ref: nokyan/resources#417

If the amdxdna driver exposes utilization information, I'll try to implement support for it. :)

[mamin506]

Hi @ThatOneCalculator , #526 start to provide per DRM client usage statistics via fdinfo.