of: Add vendor prefix for Synopsys Inc.

This patch adds a device tree vendor prefix for Synopsys Inc.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -46,6 +46,7 @@ schindler	Schindler
 sil	Silicon Image
 simtek
 sirf	SiRF Technology, Inc.
+snps 	Synopsys, Inc.
 st	STMicroelectronics
 stericsson	ST-Ericsson
 ti	Texas Instruments