of: Add Lenovo Group Ltd. to the vendor-prefixes list.

Lenovo Group Ltd. (stylized as lenovo) is a Chinese multinational computer
technology company with headquarters in Beijing, China, and Morrisville, North
Carolina, United States.

http://www.lenovo.com/

Signed-off-by: Benoit Masson <yahoo@perenite.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/1406154923-13612-1-git-send-email-yahoo@perenite.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -71,6 +71,7 @@ karo	Ka-Ro electronics GmbH
 keymile	Keymile GmbH
 lacie	LaCie
 lantiq	Lantiq Semiconductor
+lenovo	Lenovo Group Ltd.
 lg	LG Corporation
 linux	Linux-specific binding
 lsi	LSI Corp. (LSI Logic)