dt-bindings: clock: use generic node name for pmucru example in rockchip,rk3399-cru.yaml

The node names should be generic, so fix this for the pmucru node example
in the rockchip,rk3399-cru.yaml file and rename it to "clock-controller".

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220329150742.22093-3-jbx6244@gmail.com


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