soc: arm: atmel: same70: add support for MDIO driver
soc: arm: atmel: same70: add support for MDIO driver

Update to dts file to add MDIO driver.

Signed-off-by: Arvin Farahmand <4208c8ae77e6dd3ecebee6cbd1512b26823ef0ce@ip-logix.com>

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