arm64: dts: rockchip: Add rk3576 evb2 board

arm64: dts: rockchip: Add rk3576 evb2 board

General features for rk3576 evb2 board:
    - Rockchip RK3576
    - LPDDR4/4X
    - eMMC5.1
    - RK806-2x2pcs + DiscretePower
    - 1x HDMI2.1 TX / HDMI2.0 RX
    - 1x full size DP1.4 TX (Only 2 Lanes)
    - 2x 10/100/1000M Ethernet
    - 5x SATA3.0 7Pin Slot
    - 2x USB3.2 Gen1 Host
    - 3x USB2.0 Host
    - WIFI/BT
    - ...

Tested with eMMC/SDMMC/HDMI/USB/Ethernet/WIFI/BT module.

Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
Reviewed-by: Alexey Charkov <alchark@gmail.com>
Link: https://patch.msgid.link/20260131081438.100-3-kernel@airkyi.com
[added "s" to usb-hub preferred reset-gpio(s) - caused dtbs check errors]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>