i915-perf: add GPU frequency plot #56
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The function read_i915_perf_file() is always present and it's content is compiled out, so it's safe to always call it.
We would like to show GPU frequency data in the timeline. This requires to be able to find idle events so we don't have gaps in the timeline. This doesn't add much more events in the timeline and we can still filter in the rendering code.
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i915-perf reports generated by the GPU carry frequency information, we can just extract that and plot it (reusing the existing plotting code)