perf test: Skip not fail syscall tp fields test when insufficient permissions

Clean up return value to be TEST_* rather than unspecific integer. Add
test case skip reason. Skip test if EACCES comes back from
evsel__newtp.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20241001052327.7052-5-irogers@google.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>