dt-bindings: net: remove un-implemented property

The `adi,disable-energy-detect` property was implemented in an initial
version of the `adin` driver series, but after a review it was discarded in
favor of implementing the ETHTOOL_PHY_EDPD phy-tunable option.

With the ETHTOOL_PHY_EDPD control, it's possible to disable/enable
Energy-Detect-Power-Down for the `adin` PHY, so this device-tree is not
needed.

Fixes: 767078132ff9 ("dt-bindings: net: add bindings for ADIN PHY driver")
Signed-off-by: Alexandru Ardelean <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/adi,adin.yaml

···
     enum: [ 4, 8, 12, 16, 20, 24 ]
     default: 8
 
-  adi,disable-energy-detect:
-    description: |
-      Disables Energy Detect Powerdown Mode (default disabled, i.e energy detect
-      is enabled if this property is unspecified)
-    type: boolean
-
 examples:
   - |
     ethernet {
···
             reg = <1>;
 
             adi,fifo-depth-bits = <16>;
-            adi,disable-energy-detect;
         };
     };