perf debug: Remove needless include directives from debug.h

All we need there is a forward declaration for 'union perf_event', so
remove it from there and add missing header directives in places using
things from this indirect include.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-7ftk0ztstqub1tirjj8o8xbl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-report.c

@@ -45,6 +45,7 @@
 #include "util/units.h"
 #include "util/branch.h"
 #include "util/util.h"
+#include "ui/ui.h"
 
 #include <dlfcn.h>
 #include <errno.h>
@@ -53,6 +54,7 @@
 #include <linux/ctype.h>
 #include <signal.h>
 #include <linux/bitmap.h>
+#include <linux/string.h>
 #include <linux/stringify.h>
 #include <linux/time64.h>
 #include <sys/types.h>