rockchip: rk3328-rock-pi-e: Enable DM_ETH_PHY and PHY_REALTEK

rockchip: rk3328-rock-pi-e: Enable DM_ETH_PHY and PHY_REALTEK

Enable the DM_ETH_PHY and PHY_REALTEK now that the designware ethernet
driver call eth_phy_set_mdio_bus() to assist with resetting the eth PHY
during probe.

Fixes ethernet on the v1.21 hw revision of Radxa ROCK Pi E:

  => mdio list
  ethernet@ff540000:
  1 - RealTek RTL8211F <--> ethernet@ff540000
  => net list
  eth0 : ethernet@ff540000 86:e0:c0:ea:fa:a9 active
  eth1 : ethernet@ff550000 86:e0:c0:ea:fa:a8
  => dhcp
  Speed: 1000, full duplex
  BOOTP broadcast 1
  BOOTP broadcast 2
  BOOTP broadcast 3
  DHCP client bound to address 192.168.1.114 (1004 ms)

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