ARM: dts: rv1108: Add support for rv1108-elgin-r1 board

rv1108-elgin-r1 board is based on Rockchip RV1108 SoC.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>