dt-bindings: add vendor-prefix for neonode

Neonode Inc. is the Manufacturer of the zforce infraread touchscreens
used in a lot of ebook readers and supported by the zforce_ts driver.

Signed-off-by: Heiko Stuebner <heiko.stuebner@bqreaders.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -57,6 +57,7 @@ maxim	Maxim Integrated Products
 microchip	Microchip Technology Inc.
 mosaixtech	Mosaix Technologies, Inc.
 national	National Semiconductor
+neonode		Neonode Inc.
 nintendo	Nintendo
 nvidia	NVIDIA
 nxp	NXP Semiconductors