dt-bindings: vendor-prefixes: Add an entry for Van der Laan b.v.

Add "vdl" entry for Van der Laan b.v.: https://www.teamvdl.nl/



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