dt-bindings: add vendor Vertexcom

Add vendor prefix for Vertexcom Technologies, Inc [1].

[1] - http://www.vertexcom.com/

Signed-off-by: Stefan Wahren <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/devicetree/bindings/vendor-prefixes.yaml

···
     description: Variscite Ltd.
   "^vdl,.*":
     description: Van der Laan b.v.
+  "^vertexcom,.*":
+    description: Vertexcom Technologies, Inc.
   "^via,.*":
     description: VIA Technologies, Inc.
   "^videostrong,.*":