dt-bindings: arm: intel-ixp4xx: add welltech,epbx100

Adds welltech,epbx100 as a valid intel-ixp4xx board.

Link: https://lore.kernel.org/r/20210504193457.4008384-5-clabbe@baylibre.comSigned-off-by: Corentin Labbe <clabbe@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

Documentation/devicetree/bindings/arm/intel-ixp4xx.yaml

@@ -17,6 +17,7 @@ properties:
       - items:
           - enum:
               - linksys,nslu2
+              - welltech,epbx100
           - const: intel,ixp42x
       - items:
           - enum: