DT: Add Data Modul vendor prefix

Signed-off-by: Silvio F <silvio.fricke@gmail.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -28,6 +28,7 @@ cortina	Cortina Systems, Inc.
 dallas	Maxim Integrated Products (formerly Dallas Semiconductor)
 davicom	DAVICOM Semiconductor, Inc.
 denx	Denx Software Engineering
+dmo	Data Modul AG
 edt	Emerging Display Technologies
 emmicro	EM Microelectronic
 epfl	Ecole Polytechnique Fédérale de Lausanne