dt-bindings: phy: hisilicon,hi3798cv200-combphy: Convert to DT schema

dt-bindings: phy: hisilicon,hi3798cv200-combphy: Convert to DT schema

Convert the hisilicon,hi3798cv200-combphy binding to DT schema format.

Drop the example as arm/hisilicon/controller/hi3798cv200-perictrl.yaml
already contains an example of this binding.

Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240711152313.2364383-1-robh@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>