perf tools: Use symfs when opening debuginfo by path

I found that it failed to load a binary using --symfs option.  Say I
have a binary in /home/user/prog/xxx and a perf data file with it.  If I
move them to a different machine and use --symfs, it tries to find the
binary in some locations under symfs using dso__read_binary_type_filename(),
but not the last one.

  ${symfs}/usr/lib/debug/home/user/prog/xxx.debug
  ${symfs}/usr/lib/debug/home/user/prog/xxx
  ${symfs}/home/user/prog/.debug/xxx
  /home/user/prog/xxx

It should check ${symfs}/home/usr/prog/xxx.  Let's fix it.

Reviewed-by: Ian Rogers <irogers@google.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20250212221445.437481-1-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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