perf test: Basic mmap use skip

If opening the event fails for basic mmap with EACCES it is more
likely permission related that a true error. Mark the test as skip
in this case and add a skip reason.

Committer testing:

Before:

  $ perf test "mmap interface"
    4: Read samples using the mmap interface           : FAILED!
  $

After:

  $ perf test "mmap interface"
    4: Read samples using the mmap interface           : Skip (permissions)
  $

Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Carsten Haitzler <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Riccardo Mancini <[email protected]>
Cc: Sohaib Mohamed <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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