of: add vendor prefix for Chipidea

Adds chipidea to the list of DT vendor prefixes.
Signed-off-by: NPeter Chen <peter.chen@freescale.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -29,6 +29,7 @@ calxeda	Calxeda
 capella	Capella Microsystems, Inc
 cavium	Cavium, Inc.
 cdns	Cadence Design Systems Inc.
+chipidea	Chipidea, Inc
 chrp	Common Hardware Reference Platform
 chunghwa	Chunghwa Picture Tubes Ltd.
 cirrus	Cirrus Logic, Inc.