dt-bindings: arm: fsl: add Van der Laan LANMCU board

Add Van der Laan LANMCU iMX6dl based board

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>