net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs

The Allwinner H3 SoC have two distinct MDIO bus, only one could be
active at the same time.
The selection of the active MDIO bus are done via some bits in the EMAC
register of the system controller.

This patch implement this MDIO switch via a custom MDIO-mux.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -159,6 +159,7 @@ config DWMAC_SUN8I
 	tristate "Allwinner sun8i GMAC support"
 	default ARCH_SUNXI
 	depends on OF && (ARCH_SUNXI || COMPILE_TEST)
+	select MDIO_BUS_MUX
 	---help---
 	  Support for Allwinner H3 A83T A64 EMAC ethernet controllers.