perf ui browser hists: Simplify the routines that add entries to the popup menu

perf ui browser hists: Simplify the routines that add entries to the popup menu

Some don't need some args, ditch them, also struct popup_actions->evsel
isn't needed as it is always obtainable from hists_to_evsel(browser->hists).

This way we simplify debugging by reducing this needless complexity.

Tested-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/Z_dkNDj9EPFwPqq1@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>