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: NMarcin Niestroj <m.niestroj@grinn-global.com>
Reviewed-by: NTom Rini <trini@konsulko.com>

arch/arm/dts/am335x-chiliboard-u-boot.dtsi

+// 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;
+	};
+};