devicetree: Add vendor prefix "epcos" to vendor-prefixes.txt

This patch adds the vendor prefix for "epcos" to the vendor-prefixes.
Signed-off-by: Johannes Pointner <johannes.pointner@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -42,6 +42,7 @@ dmo	Data Modul AG
 ebv	EBV Elektronik
 edt	Emerging Display Technologies
 emmicro	EM Microelectronic
+epcos	EPCOS AG
 epfl	Ecole Polytechnique Fédérale de Lausanne
 epson	Seiko Epson Corp.
 est	ESTeem Wireless Modems