dt-bindings: arm: rockchip: add wolfvision pf5 mainboard

Add the WolfVision PF5 mainboard, which serves as base for recent
WolfVision products. It features the Rockchip RK3568 SoC and can
be extended with several different extension boards.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240325-feature-wolfvision-pf5-v1-2-5725445f792a@wolfvision.net


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