Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/testing/selftests/livepatch/config b/tools/testing/selftests/livepatch/config
new file mode 100644
index 0000000..ad23100
--- /dev/null
+++ b/tools/testing/selftests/livepatch/config
@@ -0,0 +1,3 @@
+CONFIG_LIVEPATCH=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_TEST_LIVEPATCH=m