DT: add vendor prefixes for Renesas and Toshiba

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -43,6 +43,7 @@ powervr	PowerVR (deprecated, use img)
 qcom	Qualcomm, Inc.
 ramtron	Ramtron International
 realtek Realtek Semiconductor Corp.
+renesas	Renesas Electronics Corporation
 samsung	Samsung Semiconductor
 sbs	Smart Battery System
 schindler	Schindler
@@ -53,6 +54,7 @@ snps 	Synopsys, Inc.
 st	STMicroelectronics
 stericsson	ST-Ericsson
 ti	Texas Instruments
+toshiba	Toshiba Corporation
 via	VIA Technologies, Inc.
 wlf	Wolfson Microelectronics
 wm	Wondermedia Technologies, Inc.