arm64: dts: rockchip: add dts for Firefly Station M2 rk3566

Add dts for Firefly Station M2.
Working IO:
* UART
* LED
* LAN
* Wifi
* SD Card
* eMMC
* USB2

Signed-off-by: Furkan Kardame <f.kardame@manjaro.org>
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Link: https://lore.kernel.org/r/20220429115252.2360496-8-pgwipeout@gmail.com


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