rockchip: add px30-evb board

The px30 evb is an evaluation board for the px30 together with a dsi-
connected display. This adds board and config files for it.

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

include/configs/evb_px30.h

@@ -0,0 +1,19 @@
+/* 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"
+
+#define CONFIG_SUPPORT_EMMC_RPMB
+
+#endif