dt-bindings: clock: samsung,s3c6400-clock: convert to DT Schema

Convert Samsung S3C6400/S3C6410 SoC clock controller bindings to DT
schema.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240312185035.720491-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>