dt-bindings: net: brcm,unimac-mdio: Add asp-v2.2

The ASP 2.2 Ethernet controller uses a brcm unimac.
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/brcm,unimac-mdio.yaml

@@ -24,6 +24,7 @@ properties:
       - brcm,genet-mdio-v5
       - brcm,asp-v2.0-mdio
       - brcm,asp-v2.1-mdio
+      - brcm,asp-v2.2-mdio
       - brcm,unimac-mdio
 
   reg: