dt: bindings: add vendor prefix for Kamstrup A/S

Kamstrup manufactures meters for electricity, heating, cooling
and water. Including long-life communication infrastructure
for e.g. smart grid based on Linux, more information on
https://www.kamstrup.comSigned-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -479,6 +479,8 @@ patternProperties:
     description: Shenzhen Jesurun Electronics Business Dept.
   "^jianda,.*":
     description: Jiandangjing Technology Co., Ltd.
+  "^kam,.*":
+    description: Kamstrup A/S
   "^karo,.*":
     description: Ka-Ro electronics GmbH
   "^keithkoep,.*":