dt-bindings: crypto: convert rockchip-crypto to YAML

Convert rockchip-crypto to YAML.

Reviewed-by: John Keeping <john@metanate.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>