ar71xx: Fix eth0 support for Ubiquiti UniFi AP AC

Fix eth0 support for the Ubiquiti UniFi AP AC
Signed-off-by: Paul Wassi <p.wassi at gmx.at>

SVN-Revision: 49277

target/linux/ar71xx/files/arch/mips/ath79/mach-ubnt-unifiac.c

@@ -84,6 +84,7 @@ static void __init ubnt_unifiac_setup(void)
 		       eeprom + UNIFIAC_MAC0_OFFSET, 0);
 
 	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_SGMII;
+	ath79_eth0_data.mii_bus_dev = &ath79_mdio0_device.dev;
 	ath79_eth0_data.phy_mask = BIT(4);
 	ath79_eth0_pll_data.pll_10 = 0x00001313;