perf: reproducibility fixes for pmu-events.c

perf generates pmu-events.c as part of the build process. The
code that generates the events is doing tree walks and potentially
other non-determinstic things.

We'd rather not mess with that implementation, so we add a script
that knows how to read the pmu-events.c, sort the entries and then
copy it over the generated one.

With this, we should always have events in the same order, improving
reproducibility.

(From OE-Core rev: 5281b2a6e16b6d24b66172b8269478356c0ce6c9)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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