perf: Fix 6.1 kernel reproducibility issue

perf: Fix 6.1 kernel reproducibility issue

The pmu-events.c file is generated by a python script making os.scandir()
calls. The return value is "order on disk" which can cary between machines.

Add in a sed to fix the perf source to sort this data which makes
the pmu-events.c file deterministic.

We should try and upstream this change but we'll need to sed for varying
kernel versions. We should also try and get the perf source being added
to the perf-devsrc package so when failures like this occur, diffoscope
is much more helpful!

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>