perf evsel: Constify option arguments to config functions
The options are used to configure the evsel but are not themselves
configured. Make the arguments const to better capture this.
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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