of: Add vendor prefix for Engicam s.r.l company

Engicam providing design services of electronic systems with
high content of technology, relying on a long experience in
electronic design.

For more info visit
http://www.engicam.com/en/

Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -85,6 +85,7 @@ elan	Elan Microelectronic Corp.
 embest	Shenzhen Embest Technology Co., Ltd.
 emmicro	EM Microelectronic
 energymicro	Silicon Laboratories (formerly Energy Micro AS)
+engicam	Engicam S.r.l.
 epcos	EPCOS AG
 epfl	Ecole Polytechnique Fédérale de Lausanne
 epson	Seiko Epson Corp.