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lisa.wlgen.rta: Strengthen sanity check on calibration values

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_pr360 into master

  • Check against the fastest CPU in each capacity class. This CPU is the one that has been the less impacted by external disturbances, that are usually random.

  • Check that the rt-app calibration values are inversely proportional to the CPU capacities. When the scaling factor diverges too much for some CPUs, raise an exception. This indicates that rt-app will be unable to provide predictable utilizations across different CPUs, which is the underlying assumption of all wlgen-based code in LISA.

  • Use the CPU capacities from plat_info rather than trying to fetch them directly using devlib. This follows the practice in LISA, allowing the user to provide the values in a configuration file in order to run as non-root (it's also faster and uses values printed in the log, for a consistent debugging experience).

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