of: add vendor prefix for Artesyn

Signed-off-by: Alessio Igor Bogani <alessio.bogani@elettra.eu>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -23,6 +23,7 @@ apm	Applied Micro Circuits Corporation (APM)
 arasan	Arasan Chip Systems
 arm	ARM Ltd.
 armadeus	ARMadeus Systems SARL
+artesyn	Artesyn Embedded Technologies Inc.
 asahi-kasei	Asahi Kasei Corp.
 atmel	Atmel Corporation
 auo	AU Optronics Corporation