ARM: rockchip: Add rv1108-elgin-r1 board support

Add the initial support for Elgin R1 board, which is based on the
RV1108 SoC and has the following features currently supported in
U-Boot:

- UART
- eMMC
- USB

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/include/configs/elgin_rv1108.h b/include/configs/elgin_rv1108.h
new file mode 100644
index 0000000..aa6c4b0
--- /dev/null
+++ b/include/configs/elgin_rv1108.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * (C) Copyright 2016 Rockchip Electronics Co., Ltd
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#include <configs/rv1108_common.h>
+
+#define CONFIG_SYS_MMC_ENV_DEV	0
+
+#endif