perf evlist: Remove duplicate headers

Code cleanup: Remove duplicate headers which are included twice.

Signed-off-by: Jagadeesh Pagadala <jagdsh.linux@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/1587276836-17088-1-git-send-email-jagdsh.linux@gmail.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>