of: Add vendor prefix for Lattice Semiconductor

Lattice Semiconductor Corporation is a manufacturer of integrated
circuits and IP products, including low-power FPGAs, video connectivity
devices and millimeter wave wireless products.

Website: http://latticesemi.comSigned-off-by: NJoel Holdsworth <joel@airwebreathe.org.uk>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NMoritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: NAlan Tull <atull@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -175,6 +175,7 @@ kosagi	Sutajio Ko-Usagi PTE Ltd.
 kyo	Kyocera Corporation
 lacie	LaCie
 lantiq	Lantiq Semiconductor
+lattice	Lattice Semiconductor
 lego	LEGO Systems A/S
 lenovo	Lenovo Group Ltd.
 lg	LG Corporation