ARM: DaVinci: fix EMAC PHY link detection

Thanks to Andrew's detective work, the issue became rather obvious.
The PHY detection code looked at the LINK register instead of the
ALIVE register for detecting the presence of a PHY. Andrew confirmed
that this patch fixed his issue.
Signed-off-by: Bernard Blackham <bernard@largestprime.net>
Signed-off-by: Andrew Armstrong <andrewa@ovation.co.uk>
Signed-off-by: Kevin Hilman <khilman@mvista.com>

drivers/net/davinci_emac_phy.c

@@ -347,7 +347,7 @@ void emac_mdio_finding_state(void)
 		--emac_phy->timeout;
 	} else {
 
-		phy_alive_status = MDIO_REG_LINK;
+		phy_alive_status = MDIO_REG_ALIVE;
 		/* Check phys based upon user mask */
 		phy_alive_status &= emac_phy->phy_mask;