dt-bindings: net: Add 5GBASER phy interface

Add 5gbase-r PHY interface mode.
Signed-off-by: Pavana Sharma <pavana.sharma@digi.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/ethernet-controller.yaml

@@ -89,6 +89,7 @@ properties:
       - trgmii
       - 1000base-x
       - 2500base-x
+      - 5gbase-r
       - rxaui
       - xaui