perf test: Skip wp modify test on old kernels

It uses PERF_EVENT_IOC_MODIFY_ATTRIBUTES ioctl.	 The kernel would return
ENOTTY if it's not supported.  Update the skip reason in that case.

Committer notes:

On s/390 the args aren't used, so need to be marked __maybe_unused.

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

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