of: Add vendor prefix for Zodiac Inflight Innovations

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -211,3 +211,4 @@ xillybus	Xillybus Ltd.
 xlnx	Xilinx
 zyxel	ZyXEL Communications Corp.
 zarlink	Zarlink Semiconductor
+zii	Zodiac Inflight Innovations