dt-bindings: Add Keith&Koep vendor prefix

Add vendor prefix for Keith&Koep GmbH , http://keith-koep.com/en/

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
[robh: fix alphabetizing]
Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 451c6f1..851e2ca 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -143,6 +143,7 @@
 jdi	Japan Display Inc.
 jedec	JEDEC Solid State Technology Association
 karo	Ka-Ro electronics GmbH
+keithkoep	Keith & Koep GmbH
 keymile	Keymile GmbH
 kinetic Kinetic Technologies
 kosagi	Sutajio Ko-Usagi PTE Ltd.