Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
index a039f93..ae6cda8 100644
--- a/tools/perf/tests/llvm.c
+++ b/tools/perf/tests/llvm.c
@@ -1,12 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <bpf/libbpf.h>
 #include <util/llvm-utils.h>
-#include <util/cache.h>
 #include "llvm.h"
 #include "tests.h"
 #include "debug.h"
-#include "util.h"
 
 #ifdef HAVE_LIBBPF_SUPPORT
 static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)