dt-bindings: arm: rockchip: Add Firefly Station P2

Station P2 is a single board computer by firefly based
on rk3568 soc

Signed-off-by: Furkan Kardame <f.kardame@manjaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230620184746.55391-2-f.kardame@manjaro.org


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