doc: release-notes-4.0: Add ethernet/mdio notes

* Ethernet

  * LiteX: Renamed the ``compatible`` from ``litex,eth0`` to :dtcompatible:`litex,liteeth`.

  * STM32: Driver can now be configured to use a preemptive RX thread priority, which could be useful

  * Added a :c:func:`get_phy` function to the ethernet driver api, which returns the phy device

    associated to a network interface.

  * Added 2.5G and 5G link speeds to the ethernet hardware capabilities api.

  * Added check for null api pointer in :c:func:`net_eth_get_hw_capabilities`, fixing netusb crash.

  * Added synopsis dwc_xgmac ethernet driver.

  * Added NXP iMX NETC driver.

  * Adin2111

    * Fixed bug that resulted in double RX buffer read when generic spi protocol is used.

    * Fixed essential thread termination on OA read failure.

    * Skip checks for port 2 on the adin1110 since it doesn't apply, as there is no port 2.

  * ENC28J60

    * Added support for the ``zephyr,random-mac-address`` property.

    * Fixed race condition between interrupt service and L2 init affecting carrier status in init.

  * ENC424j600: Added ability to change mac address at runtime with net management api.

  * ESP32: Added configuration of interrupts from DT.

  * Lan865x

    * Enable all multicast MAC address for IPv6. All multicast mac address can now be

      received and allows for correct handling of the IPv6 neighbor discovery protocol.

    * Fixed transmission stopping when setting mac address or promiscuous mode.

  * LiteX

    * Renamed the ``compatible`` from ``litex,eth0`` to :dtcompatible:`litex,liteeth`.

    * Added support for multiple instances of the liteX ethernet driver.

    * Added support for VLAN to the liteX ethernet driver.

    * Added phy support.

  * Native_posix

    * Implemented getting the interface name from the command line.

    * Now prints error number in error message when creating an interface.

  * NXP ENET_QOS: Fixed check for ``zephyr,random-mac-address`` property.

  * NXP ENET:

    * Fixed fused MAC address initialization code.

    * Fixed code path for handling tx errors with timestamped frames.

    * Fixed network carrier status race condition during init.

  * NXP S32: Added configs to enable VLAN promiscuous and untagged, and enable SI message interrupt.

  * STM32

    * Driver can now be configured to use a preemptive RX thread priority, which could be useful

      in case of high network traffic load (reduces jitter).

    * Added support for DT-defined mdio.

    * Fixed bus error after network disconnection that happened in some cases.

  * TC6: Combine read chunks into continuous net buffer. This fixes IPv6 neighbor discovery protocol

    because 64 bytes was not enough for all headers.

  * PHY driver changes

    * Added Qualcomm AR8031 phy driver.

    * Added DP83825 phy driver.

    * PHY_MII

      * Fixed generic phy_mii driver not using the value of the ``no-reset`` property from devicetree.

      * Removed excess newlines from log output of phy_mii driver.

    * KSZ8081

      * Fixed reset times during init that were unnecessarily long.

      * Removed unnecessary reset on every link configuration that blocked system workqueue

      * Fixed issue relating to strap-in override bits.

* Flash

* MDIO

  * Added litex MDIO driver.

  * Added support for mdio shell to stm32 mdio.

  * Added mdio driver for dwc_xgmac synopsis ethernet.

  * Added NXP IMX NETC mdio driver.

  * NXP ENET MDIO: Fixed inconsistent behavior by keeping the mdio interrupt enabled all the time.

* MFD

* Modem