dt-bindings: arm: rockchip: add Theobroma Systems PX30-µQ7 (Ringneck) with Haikou

Add entry for the Theobroma Systems PX30-µQ7 (Ringneck) with Haikou
devkit.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20220930-upstream-ringneck-v2-2-6671694b6934@theobroma-systems.com


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