ARM: dts: am335x-chiliboard: add /chosen/stdout-path

Add that node path in u-boot overlay dtsi file for now to keep
am335x-chiliboard.dts in sync with Linux.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/dts/am335x-chiliboard-u-boot.dtsi b/arch/arm/dts/am335x-chiliboard-u-boot.dtsi
new file mode 100644
index 0000000..4f9d308
--- /dev/null
+++ b/arch/arm/dts/am335x-chiliboard-u-boot.dtsi
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+ or X11
+/*
+ * Copyright (C) 2018 Grinn Sp. z o.o. -- http://www.grinn-global.com/
+ * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
+ */
+
+/ {
+	chosen {
+		stdout-path = &uart0;
+	};
+};