rockchip: board: add Hardkernel Odroid Go2 board

Also known as Odroid Go Advance but named Go2 internally by the
vendor it seems.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

include/configs/odroid_go2.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2017 Rockchip Electronics Co., Ltd
+ */
+
+#ifndef __EVB_PX30_H
+#define __EVB_PX30_H
+
+#include <configs/px30_common.h>
+
+#define CONFIG_SYS_MMC_ENV_DEV 0
+
+#define ROCKCHIP_DEVICE_SETTINGS \
+		"stdout=serial,vidconsole\0" \
+		"stderr=serial,vidconsole\0"
+
+#endif