arm64: dts: rockchip: add Anbernic RG353PS

arm64: dts: rockchip: add Anbernic RG353PS

Add support for the Anbernic RG353PS. This device is identical in form
factor to the RG353P and has the following hardware differences:
 - No touchscreen is present on i2c2 (or at all).
 - Only contains 1GB of RAM.
 - Has no eMMC.
 - Only appears to ship with the 2nd revision of the display panel.

Note that the display panel has been added to the st7703 panel driver
in a separate commit series.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20230512162039.31132-3-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>