dt-bindings: Add vendor prefix for Udoo

Udoo (http://www.udoo.org/) manufactures development boards based on
i.MX and x86.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -293,6 +293,7 @@ tronfy	Tronfy
 tronsmart	Tronsmart
 truly	Truly Semiconductors Limited
 tyan	Tyan Computer Corporation
+udoo	Udoo
 uniwest	United Western Technologies Corp (UniWest)
 upisemi	uPI Semiconductor Corp.
 urt	United Radiant Technology Corporation