perf test: Do not use instructions:u explicitly

I think it's to support non-root user tests.  But perf record can handle
the case and fall back to a software event (cpu-clock).  Practically this
would affect when it's run on a VM, but it seems no reason to prevent running
the test in the guest.

Reviewed-by: Adrian Hunter <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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