dt-bindings: vendor-prefixes: add Methode Electronics

Add vendor prefix for Methode Electronics, Inc. (https://www.methode.com

)

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