imx: kontron-sl-mx8mm: Sync dts files and fix ethernet

This syncs the devicetree files with the latest Linux kernel (5.19-rc2).
This also fixes the currently broken ethernet support:

Before:

  Net:   Could not get PHY for FEC0: addr 0

After:

  Net:   eth0: ethernet@30be0000

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>