boards: shields: nrf7002eb: align with nrf700x split interface

Exclude the coex interface if the coex variant of the nrf7002eb
is selected instead of adding the interface alongside the
wifi/control interface.

Signed-off-by: Bjarki Arge Andreasen <[email protected]>

Author: bjarki-andreasen

boards/shields/nrf7002eb/nrf7002eb_coex.overlay

@@ -4,10 +4,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "nrf7002eb.overlay"
+/ {
+	nrf70: coex {
+		compatible = "nordic,nrf7002-coex";
+		status = "okay";
 
-&nrf70 {
-	status0-gpios = <&edge_connector 5 GPIO_ACTIVE_HIGH>;
-	req-gpios = <&edge_connector 6 GPIO_ACTIVE_HIGH>;
-	grant-gpios = <&edge_connector 15 (GPIO_PULL_DOWN | GPIO_ACTIVE_LOW)>;
+		status0-gpios = <&edge_connector 5 GPIO_ACTIVE_HIGH>;
+		req-gpios = <&edge_connector 6 GPIO_ACTIVE_HIGH>;
+		grant-gpios = <&edge_connector 15 (GPIO_PULL_DOWN | GPIO_ACTIVE_LOW)>;
+	};
 };