verdin-imx8mp: Ethernet does not load at boot

[Sahaj Sarup]

Hi,

On a verdin-imx8mp platform I am now unable to use the ethernet ports.
My last build was from December
(8f5043ee6d378d7c10d947cf48b047a5954ef5b3) so it was working fine
then.

Boot log:

```
U-Boot SPL 2024.04-rc2-00002-gbef352dd57-dirty (Feb 16 2024 - 10:07:17 +0530)
Training FAILED
DDR configured as single rank
SEC0:  RNG instantiated
Normal Boot
WDT:   Started watchdog at 30280000 with servicing every 1000ms (60s timeout)
Trying to boot from BOOTROM
Boot Stage: Primary boot
Find img info 0x4802ae00, size 1044
Need continue download 1024
NOTICE:  Do not release JR0 to NS as it can be used by HAB
NOTICE:  BL31: v2.10.0  (release):v2.10.0-44-g2e1e1664c
NOTICE:  BL31: Built : 13:09:20, Dec  1 2023


U-Boot 2024.04-rc2-00002-gbef352dd57-dirty (Feb 16 2024 - 10:07:17 +0530)

CPU:   Freescale i.MX8MP[8] rev1.1 1600 MHz (running at 1200 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 36C
Reset cause: POR
DRAM:  4 GiB
Core:  171 devices, 28 uclasses, devicetree: separate
WDT:   Started watchdog at 30280000 with servicing every 1000ms (60s timeout)
MMC:   FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... *** Warning - bad CRC, using default environment

In:    serial at 30880000
Out:   serial at 30880000
Err:   serial at 30880000
Model: Toradex Verdin iMX8M Plus WB on Verdin Development Board
SEC0:  RNG instantiated
Setting variant to nonwifi
Net:
Error: ethernet at 30bf0000 No valid MAC address found.
Can't find FEC0 clk rate: -22

Error: ethernet at 30bf0000 No valid MAC address found.
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Could not get PHY for mdio: addr 7
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Could not get PHY for FEC1: addr 7

Error: ethernet at 30bf0000 No valid MAC address found.
Can't find FEC0 clk rate: -22

Error: ethernet at 30bf0000 No valid MAC address found.
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Could not get PHY for mdio: addr 7
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Read MDIO failed...
Could not get PHY for FEC1: addr 7

Error: ethernet at 30bf0000 No valid MAC address found.

Error: ethernet at 30bf0000 No valid MAC address found.
No ethernet found.

Hit any key to stop autoboot:  0

```