net: stmmac: ingenic: convert to use phy_interface

net: stmmac: ingenic: convert to use phy_interface

dwmac-ingenic uses only MII, RMII, GMII or RGMII interface modes, none
of which require any kind of conversion between the MAC and external
world. Thus, mac_interface and phy_interface will be the same.

Convert dwmac-ingenic to use phy_interface when determining the
interface mode that the dwmac core should be configured to at reset,
rather than mac_interface.

Also convert the error prints to use phy_modes() and terminate with a
newline so that we get a human readable string rather than a number for
the interface mode.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1uytpQ-00000006H2L-2Jzb@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>