arm64: dts: rockchip: add poll-interval to RGxx3 devices

Add adc-joystick polling for all Anbernic RGxx3 based devices.
They are all functionally identical in how they work.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20221028184045.13113-5-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>