media: dt-bindings: Add bindings for Dongwoon DW9714 voice coil

Dongwoon DW9714 is a voice coil lens driver.

Also add a vendor prefix for Dongwoon for one did not exist previously.
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/devicetree/bindings/media/i2c/dongwoon,dw9714.txt

+Dongwoon Anatech DW9714 camera voice coil lens driver
+
+DW9174 is a 10-bit DAC with current sink capability. It is intended
+for driving voice coil lenses in camera modules.
+
+Mandatory properties:
+
+- compatible: "dongwoon,dw9714"
+- reg: I²C slave address

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -88,6 +88,7 @@ dlg	Dialog Semiconductor
 dlink	D-Link Corporation
 dmo	Data Modul AG
 domintech	Domintech Co., Ltd.
+dongwoon	Dongwoon Anatech
 dptechnics	DPTechnics
 dragino	Dragino Technology Co., Limited
 ea	Embedded Artists AB