Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index 48e3743..9457863 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -92,7 +92,8 @@
 	if (devp == NULL)
 		goto err_out;
 
-	if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0) {
+	if (getprop(devp, "linux,stdout-path", path, MAX_PATH_LEN) > 0 ||
+		getprop(devp, "stdout-path", path, MAX_PATH_LEN) > 0) {
 		devp = finddevice(path);
 		if (devp == NULL)
 			goto err_out;