perf arm64: Add missing debug.h header

This file uses pr_debug() but isn't including debug.h, getting it by
luck, fix it.

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-t7pisnsdfh88kclpw52jcwl7@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/arm64/util/header.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <api/fs/fs.h>
+#include "debug.h"
 #include "header.h"
 
 #define MIDR "/regs/identification/midr_el1"