dt-bindings: net: cdns,macb: Drop phy-names property for ZynqMP SGMII PHY

In zynqmp SGMII initialization, there is a single PHY so remove phy-names
property as there is no real need of having it.
Signed-off-by: NRadhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/cdns,macb.yaml

@@ -84,13 +84,6 @@ properties:
   phys:
     maxItems: 1
 
-  phy-names:
-    const: sgmii-phy
-    description:
-      Required with ZynqMP SoC when in SGMII mode.
-      Should reference PS-GTR generic PHY device for this controller
-      instance. See ZynqMP example.
-
   resets:
     maxItems: 1
     description:
@@ -204,7 +197,6 @@ examples:
                     reset-names = "gem1_rst";
                     status = "okay";
                     phy-mode = "sgmii";
-                    phy-names = "sgmii-phy";
                     phys = <&psgtr 1 PHY_TYPE_SGMII 1 1>;
                     fixed-link {
                             speed = <1000>;