dt-bindings: Add vendor prefix for PHICOMM Co., Ltd.

PHICOMM Co., Ltd. is a hardware provider headquartered in Shanghai, it's
product includes router and smart devices.

Signed-off-by: He Yangxuan <yangxuan8282@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -296,6 +296,7 @@ panasonic	Panasonic Corporation
 parade	Parade Technologies Inc.
 pericom	Pericom Technology Inc.
 pervasive	Pervasive Displays, Inc.
+phicomm PHICOMM Co., Ltd.
 phytec	PHYTEC Messtechnik GmbH
 picochip	Picochip Ltd
 pine64	Pine64