Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/util/syscalltbl.h b/tools/perf/util/syscalltbl.h
index c8e7e9c..9172613 100644
--- a/tools/perf/util/syscalltbl.h
+++ b/tools/perf/util/syscalltbl.h
@@ -6,6 +6,7 @@
 	union {
 		int audit_machine;
 		struct {
+			int max_id;
 			int nr_entries;
 			void *entries;
 		} syscalls;