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>