[REQUEST] Rockchip NPU utilization on Linux

[bjia56]

Is your feature request related to a problem? Please describe.
btop provides a great dashboard of critical system metrics, but currently does not monitor (at least, to my knowledge) utilization of the Rockchip NPU (e.g. on the Orange Pi 5).

Describe the solution you'd like
Add a new section to the default btop view which displays a graph of NPU utilization over time.

Describe alternatives you've considered
rknputop is another terminal tool which reads from /sys/kernel/debug/rknpu/load and displays the information to screen.

Additional context
With more manufacturers integrating NPU hardware (e.g. Intel), it may be useful to display NPU data as a first-class citizen inside btop, such as alongside CPU and GPU data.