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/arch/arm/mach-rockchip/rv1108/Kconfig b/arch/arm/mach-rockchip/rv1108/Kconfig
index e6cba66..8883aea 100644
--- a/arch/arm/mach-rockchip/rv1108/Kconfig
+++ b/arch/arm/mach-rockchip/rv1108/Kconfig
@@ -17,6 +17,11 @@
 	   * 10/100 Mbps Ethernet
 	   * camera interface compatible with imx323 / ov2710 / ov4689
 
+config TARGET_ELGIN_RV1108
+	bool "ELGIN_RV1108"
+	help
+	  RV1108 ELGIN is a board based on the Rockchip RV1108.
+
 config SYS_SOC
 	default "rockchip"
 
@@ -24,5 +29,6 @@
 	default 0x400
 
 source board/rockchip/evb_rv1108/Kconfig
+source board/elgin/elgin_rv1108/Kconfig
 
 endif