arm64: dts: rockchip: create common dtsi for NanoPi R5 series

Create common dtsi for the FriendlyElec NanoPi R5 series.

Signed-off-by: Tianling Shen <cnsztl@gmail.com>
Link: https://lore.kernel.org/r/20230318083745.6181-2-cnsztl@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>