net/designware: call phy_connect_dev() to properly setup phylib device

This sets up the linkage from the phydev back to the ethernet device. This
symptom of not doing this which I noticed was:
    <NULL> Waiting for PHY auto negotiation to complete....
rather than:
    dwmac.1c50000 Waiting for PHY auto negotiation to complete....

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Alexey Brodkin <Alexey.Brodkin@synopsys.com>
diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index c45593b..78751b2 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -390,6 +390,8 @@
 	if (!phydev)
 		return -1;
 
+	phy_connect_dev(phydev, dev);
+
 	phydev->supported &= PHY_GBIT_FEATURES;
 	phydev->advertising = phydev->supported;