mvebu: use upstream DTS for Methode eDPU

All changes to the DTS have been applied upstream, remove our DTS copy.

This change effectively drops the workaround for the 2500Base-x
interface which was broken until kernel 5.15 and removes redundant
address-/size-cells.

Signed-off-by: Stefan Kalscheuer <stefan@stklcode.de>
Link: https://github.com/openwrt/openwrt/pull/19786
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/mvebu/files/arch/arm64/boot/dts/marvell/armada-3720-eDPU.dts

@@ -1,66 +0,0 @@
-// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
-
-/dts-v1/;
-
-#include "armada-3720-uDPU.dtsi"
-
-/ {
-	model = "Methode eDPU Board";
-	compatible = "methode,edpu", "marvell,armada3720", "marvell,armada3710";
-};
-
-/* PHY mode is set to 1000Base-X despite Maxlinear IC being capable of
- * 2500Base-X since until 5.15 support for mvebu is available trying to
- * use 2500Base-X will cause buffer overruns for which the fix is not
- * easily backportable.
- */
-&eth0 {
-	phy-mode = "1000base-x";
-};
-
-/*
- * External MV88E6361 switch is only available on v2 of the board.
- * U-Boot will enable the MDIO bus and switch nodes.
- */
-&mdio {
-	status = "disabled";
-	pinctrl-names = "default";
-	pinctrl-0 = <&smi_pins>;
-
-	/* Actual device is MV88E6361 */
-	switch: switch@0 {
-		compatible = "marvell,mv88e6190";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		reg = <0>;
-		status = "disabled";
-
-		ports {
-			#address-cells = <1>;
-			#size-cells = <0>;
-
-			port@0 {
-				reg = <0>;
-				label = "cpu";
-				phy-mode = "2500base-x";
-				managed = "in-band-status";
-				ethernet = <&eth0>;
-			};
-
-			port@9 {
-				reg = <9>;
-				label = "downlink";
-				phy-mode = "2500base-x";
-				managed = "in-band-status";
-			};
-
-			port@a {
-				reg = <10>;
-				label = "uplink";
-				phy-mode = "2500base-x";
-				managed = "in-band-status";
-				sfp = <&sfp_eth1>;
-			};
-		};
-	};
-};