dt-bindings: mmc: hisilicon,hi3798cv200-dw-mshc: add Hi3798MV200 binding

Add binding and an extra property for Hi3798MV200 DWMMC specific extension.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
Link: https://lore.kernel.org/r/20240229-b4-mmc-hi3798mv200-v7-4-10c03f316285@outlook.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>