dt-bindings: arm: rockchip: Add Radxa ROCK 5B+

The Radxa ROCK 5B+ is an improved version of the ROCK 5B.

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20250508-rock5bp-for-upstream-v2-3-677033cc1ac2@kernel.org


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