dt-bindings: Add vendor prefix for Hwacom Systems Inc.

Hwacom Systems Inc. is a broadband system integrator and supplier of
mobile, fixed and IP networks related services as well as
multimedia application. Website: http://www.hwacom.com/

Signed-off-by: Carlo Caione <carlo@endlessm.com>
Acked-by: Rob Herring <robh@kernel.org>
[khilman: change shortlog prefix to dt-bindings]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -136,6 +136,7 @@ holt	Holt Integrated Circuits, Inc.
 honeywell	Honeywell
 hp	Hewlett Packard
 holtek	Holtek Semiconductor, Inc.
+hwacom	HwaCom Systems Inc.
 i2se	I2SE GmbH
 ibm	International Business Machines (IBM)
 idt	Integrated Device Technologies, Inc.