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Update AMD GPU code to add Power Usage sensor

Stavros Karpozilos requested to merge themastoras/ksystemstats:themastoras-amdgpupower into master

I've updated the relevant code in the AMD GPU files to access the sysfs and retrieve the power metrics for the AMD GPUs, namely the following:

[DevicePath]/hwmon/hwmonX/power1_average (updates the value)
[DevicePath]/hwmon/hwmonX/power1_cap_min (updates the Min value)
[DevicePath]/hwmon/hwmonX/power1_cap_default (updates the Max value)

The code also looks for the relevant hwmon/hwmonX folder, as X could change between systems. It essentially searches the [DevicePath]/hwmon/* directory for the hwmon* pattern and uses the first directory that matches the pattern (which should always be a single directory, as the hwmon path is specific to the device).

The code compiles and runs fine (it has been tested a few dozen times) and example output can be seen below:
AMD_power_usage_example_output

The sensor placement can be seen below:
AMD_power_usage_sensor_placement

The code has been compiled and tested against a system with the following info:
about_system

Edited by Stavros Karpozilos

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