net: designware: Reset eth phy before phy connect

net: designware: Reset eth phy before phy connect

Some ethernet PHY require being reset before a phy-id can be read back
on the MDIO bus. This can result in the following message being show
on e.g. a Radxa ROCK Pi E v1.21 with a RTL8211F ethernet PHY.

  Could not get PHY for ethernet@ff540000: addr -1

Add support to designware ethernet driver to reset eth phy by calling
the eth phy uclass function eth_phy_set_mdio_bus(). The call use NULL
as bus parameter to not set a shared mdio bus reference that would be
freed when probe fails. Also add a eth_phy_get_addr() call to try and
get the phy addr from DT when DM_MDIO is disabled.

This help fix ethernet on Radxa ROCK Pi E v1.21:

  => mdio list
  ethernet@ff540000:
  1 - RealTek RTL8211F <--> ethernet@ff540000

Reported-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>