drivers: eth: native_posix: Add support for setting ethernet MAC address
drivers: eth: native_posix: Add support for setting ethernet MAC address

If CONFIG_ETH_NATIVE_POSIX_RANDOM_MAC=n and
CONFIG_ETH_NATIVE_POSIX_MAC_ADDR="", the MAC address can be set with a
net_mgmt call before the driver is initialized.

Signed-off-by: Björn Stenberg <8a2957e0063f2abf61bd145b6236a74a3708ac54@haxx.se>

finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr