dt-bindings: Add vendor prefix for elgin

Add elgin vendor definition as 'Elgin S/A.'
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -113,6 +113,7 @@ eckelmann	Eckelmann AG
 edt	Emerging Display Technologies
 eeti	eGalax_eMPIA Technology Inc
 elan	Elan Microelectronic Corp.
+elgin	Elgin S/A.
 embest	Shenzhen Embest Technology Co., Ltd.
 emlid	Emlid, Ltd.
 emmicro	EM Microelectronic