dt-bindings: vendor-prefixes: Add an entry for SKOV A/S

Add "skov" entry for the SKOV A/S: https://www.skov.com/en/



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