perf parser: Remove needless include directives

They go on accumulating there like the debug.h one, that was introduced
here:

  f23610245c ("perf list: Add debug support for outputing alias string")

But then, when that need is removed via:

  2073ad3326 ("perf tools: Factor out PMU matching in parser")

The thing stays there, so continue the house cleaning spree...

list.h not needed, no macros from there are used, and 'struct
list_head' is in linux/types.h, ditto for util.h, no need for that as
well.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-zkxr3mf6inun8m5mbnil4u0d@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.y

@@ -11,12 +11,9 @@
 #include <fnmatch.h>
 #include <stdio.h>
 #include <linux/compiler.h>
-#include <linux/list.h>
 #include <linux/types.h>
-#include "util.h"
 #include "pmu.h"
 #include "evsel.h"
-#include "debug.h"
 #include "parse-events.h"
 #include "parse-events-bison.h"