of: Add vendor prefix for Hitachi Ltd. Corporation

Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -67,6 +67,7 @@ gw	Gateworks Corporation
 hannstar	HannStar Display Corporation
 haoyu	Haoyu Microelectronic Co. Ltd.
 hisilicon	Hisilicon Limited.
+hit	Hitachi Ltd.
 honeywell	Honeywell
 hp	Hewlett Packard
 i2se	I2SE GmbH