samples/net/sockets/echo_server/ sample.net.sockets.echo_server.usbnet fails to build for stm32h747i_disco/stm32h747xx/m7 on main

[aescolar]

Describe the bug
samples/net/sockets/echo_server/ fails to build for stm32h747i_disco/stm32h747xx/m7

To Reproduce
Steps to reproduce the behavior:

1. twister -p stm32h747i_disco/stm32h747xx/m7 -T samples/net/sockets/echo_server/ -s sample.net.sockets.echo_server.usbnet
2. See error

Expected behavior
No build errors

Impact
main CI failing blocking PRs which trigger this sample/boards combination

Logs and console output
https://github.com/zephyrproject-rtos/zephyr/actions/runs/8984763903/job/24679138638?pr=68127

Environment (please complete the following information):

• OS: Linux (CI)
• Toolchain (e.g Zephyr SDK, ...): Zephyr SDK
• Commit SHA or Version used: Main as of now 4d406b1

Additional context
Introduced by #71012
Bisected to ac165f6

[aescolar]

CC @spectrum70

[aescolar]

CC @erwango @FRASTM

[foss0guru]

Hi @aescolar the following patch solves the issue

--- a/boards/st/stm32h747i_disco/stm32h747i_disco_stm32h747xx_m7.dts
+++ b/boards/st/stm32h747i_disco/stm32h747i_disco_stm32h747xx_m7.dts
@@ -130,9 +130,7 @@
         */
        status = "okay";
        pinctrl-0 = <&eth_ref_clk_pa1
-                    &eth_mdio_pa2
                     &eth_crs_dv_pa7
-                    &eth_mdc_pc1
                     &eth_rxd0_pc4
                     &eth_rxd1_pc5
                     &eth_tx_en_pg11
@@ -141,6 +139,18 @@
        pinctrl-names = "default";
 };

+&mdio {
+       status = "okay";
+       pinctrl-0 = <&eth_mdio_pa2 &eth_mdc_pc1>;
+       pinctrl-names = "default";
+
+       ethernet-phy@0 {
+               compatible = "ethernet-phy";
+               reg = <0x00>;
+               status = "okay";
+       };
+};
+
 &rng {
        status = "okay";
 };