dt-bindings: marvell: convert Armada 37xx compatibles to YAML

Convert the Armada 37xx SoC compatibles to YAML.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>