of: add vendor prefix for I2SE GmbH

Add i2se to the list of DT vendor prefixes.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -53,6 +53,7 @@ haoyu	Haoyu Microelectronic Co. Ltd.
 hisilicon	Hisilicon Limited.
 honeywell	Honeywell
 hp	Hewlett Packard
+i2se	I2SE GmbH
 ibm	International Business Machines (IBM)
 idt	Integrated Device Technologies, Inc.
 img	Imagination Technologies Ltd.