dt-bindings: clock: convert rockchip,rk3288-cru.txt to YAML

dt-bindings: clock: convert rockchip,rk3288-cru.txt to YAML

Current dts files with RK3288 'cru' nodes are manually verified.
In order to automate this process rockchip,rk3288-cru.txt has to be
converted to YAML.

Changed:
  Add properties to fix notifications by clocks.yaml for example:
    clocks
    clock-names

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220329113657.4567-1-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>