perf tools: Remove misleading comments on map functions

When it converts sample IP to or from objdump-capable one, there's a
comment saying that kernel modules have DSO_SPACE__USER.  But commit
02213cec

 ("perf maps: Mark module DSOs with kernel type") changed
it and makes the comment confusing.  Let's get rid of it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20240208181025.1329645-1-namhyung@kernel.org