dt-bindings: vendor-prefixes: add DFI

Document binding for DFI Inc. company (https://www.dfi.com).
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200926162811.5335-1-krzk@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -263,6 +263,8 @@ patternProperties:
     description: Denx Software Engineering
   "^devantech,.*":
     description: Devantech, Ltd.
+  "^dfi,.*":
+    description: DFI Inc.
   "^dh,.*":
     description: DH electronics GmbH
   "^difrnce,.*":