arm64: dts: rockchip: Add Powkiddy RK2023

Add support for the Powkiddy RK2023. The Powkiddy RK2023 is a handheld
gaming device with a 3.5 inch screen powered by the Rockchip RK3566
SoC. The device looks physically different from the Powkiddy RGB30,
but is functionally identical except for the panel.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20231117202536.1387815-7-macroalpha82@gmail.com


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