dts: bindings: ethernet: Remove fixed link

Remove ethernet-fixed-link binding as it is redundant with the
phy bindings. Clearly, ethernet does not work without the L1
layer, which is a phy device, or an integrated mac/phy device,
and all of these things should be described properly in DT.
The schema did not even come with a compatible, meaning nodelabels
were hardcoded into the drivers, which is unacceptable.

- Remove the binding file for ethernet-fixed-link.yaml.
- Remove fixed link functionality from the nxp s32 gmac driver.
  Since this functionality is already covered by the phy support,
  it is redundant.
- Remove fixed link include from the s32 gmac binding.
- Remove fixed link include from the nuvoton numaker binding.
  As far as I can tell the corresonding driver does not even
  use it anyways, and I did not find any board with this device
  that describes a "fixed link".
- Move the definition into the nxp,kinetis-ethernet binding
  as the eth_mcux driver, which is already being deprecated,
  does use this, contain the debt to the legacy driver.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>

dts/bindings/ethernet/ethernet,fixed-link.yaml

@@ -1,17 +0,0 @@
-# Copyright (c) 2020, DENX Software Engineering GmbH
-#                     Lukasz Majewski <lukma@denx.de>
-# SPDX-License-Identifier: Apache-2.0
-
-child-binding:
-  description: Fixed link ethernet node
-  properties:
-    speed:
-      type: int
-      required: true
-      description: The speed of fixed link
-      enum:
-        - 100
-        - 10
-    full-duplex:
-      type: boolean
-      description: The fixed link operates in full duplex mode

dts/bindings/ethernet/nuvoton,numaker-ethernet.yaml

@@ -7,7 +7,6 @@ compatible: "nuvoton,numaker-ethernet"
 
 include:
   - ethernet-controller.yaml
-  - ethernet,fixed-link.yaml
   - reset-device.yaml
   - pinctrl-device.yaml
 

dts/bindings/ethernet/nxp,enet-mac.yaml

@@ -5,7 +5,7 @@ description: NXP ENET MAC/L2 Device
 
 compatible: "nxp,enet-mac"
 
-include: ["ethernet-controller.yaml", "ethernet,fixed-link.yaml", "pinctrl-device.yaml"]
+include: ["ethernet-controller.yaml", "pinctrl-device.yaml"]
 
 properties:
   interrupts:

dts/bindings/ethernet/nxp,kinetis-ethernet.yaml

@@ -5,7 +5,7 @@ description: NXP Kinetis Ethernet
 
 compatible: "nxp,kinetis-ethernet"
 
-include: ["ethernet-controller.yaml", "ethernet,fixed-link.yaml", "pinctrl-device.yaml"]
+include: ["ethernet-controller.yaml", "pinctrl-device.yaml"]
 
 properties:
   reg:
@@ -23,3 +23,17 @@ properties:
     type: phandle-array
     description:
       interrupt GPIO for PHY. Will be pulled high before reset is asserted.
+
+child-binding:
+  description: Fixed link ethernet node
+  properties:
+    speed:
+      type: int
+      required: true
+      description: The speed of fixed link
+      enum:
+        - 100
+        - 10
+    full-duplex:
+      type: boolean
+      description: The fixed link operates in full duplex mode

dts/bindings/ethernet/nxp,s32-gmac.yaml

@@ -5,7 +5,7 @@ description: NXP S32 GMAC/EMAC driver
 
 compatible: "nxp,s32-gmac"
 
-include: [ethernet-controller.yaml, "ethernet,fixed-link.yaml", pinctrl-device.yaml]
+include: [ethernet-controller.yaml, pinctrl-device.yaml]
 
 properties:
   reg: