of: Add vendor prefix for Richtek Technology Corporation

Signed-off-by: Anda-Maria Nicolae <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Sebastian Reichel <[email protected]>

Author: andanicolae

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -161,6 +161,7 @@ ralink	Mediatek/Ralink Technology Corp.
 ramtron	Ramtron International
 realtek Realtek Semiconductor Corp.
 renesas	Renesas Electronics Corporation
+richtek	Richtek Technology Corporation
 ricoh	Ricoh Co. Ltd.
 rockchip	Fuzhou Rockchip Electronics Co., Ltd
 samsung	Samsung Semiconductor