dts: binding: ethernet-phy: add 1G fixed-link support

Added 1G link support for fixed-link.

Signed-off-by: Jiafei Pan <[email protected]>

Author: JiafeiPan

dts/bindings/ethernet/ethernet-phy.yaml

@@ -24,3 +24,5 @@ properties:
       - "10BASE-T Full-Duplex"
       - "100BASE-T Half-Duplex"
       - "100BASE-T Full-Duplex"
+      - "1000BASE-T Half-Duplex"
+      - "1000BASE-T Full-Duplex"