of: Add vendor prefix for Chips&Media, Inc.

Chips&Media is a developer of Video Codec IP cores.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
[robh: fix-up alphabetical ordering]
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -34,6 +34,7 @@ chipidea	Chipidea, Inc
 chrp	Common Hardware Reference Platform
 chunghwa	Chunghwa Picture Tubes Ltd.
 cirrus	Cirrus Logic, Inc.
+cnm	Chips&Media, Inc.
 cortina	Cortina Systems, Inc.
 crystalfontz	Crystalfontz America, Inc.
 dallas	Maxim Integrated Products (formerly Dallas Semiconductor)