of: add vendor prefix for Toradex AG

Adds toradex to the list of DT vendor prefixes.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -123,6 +123,7 @@ stericsson	ST-Ericsson
 synology	Synology, Inc.
 ti	Texas Instruments
 tlm	Trusted Logic Mobility
+toradex	Toradex AG
 toshiba	Toshiba Corporation
 toumaz	Toumaz
 usi	Universal Scientifc Industrial Co., Ltd.