dts: bindings: wifi: nordic-wlan: Include wifi interface bindings

Create a generic Wi-Fi interface binding file which includes the
ethernet-controller.yaml bindings and include it in Nordic's WLAN
interface binding.

Signed-off-by: Pieter De Gendt <[email protected]>

Author: pdgendt

dts/bindings/wifi/nordic,wlan.yaml

@@ -9,3 +9,5 @@ description: |
   interfaces like wlan0.
 
 compatible: "nordic,wlan"
+
+include: wifi-interface.yaml

dts/bindings/wifi/wifi-interface.yaml

@@ -0,0 +1,6 @@
+# Copyright (c) 2025, Basalte bv
+# SPDX-License-Identifier: Apache-2.0
+
+# Common fields for Wi-Fi interfaces
+
+include: ethernet-controller.yaml