Use the modern DM MDIO API for connecting PHY in the mvneta driver.
This requires enabling MVMDIO driver in several config files.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>