arm64: dts: rockchip: add rk3566 dtsi

Add the rk3566 dtsi which includes the soc specific changes for this
chip.

Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20210710151034.32857-4-pgwipeout@gmail.com


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