net: phy: Unpublish phy_connect_dev()

The phy_connect_dev() is legacy API, now that there are no users,
make it internal to phy.c and unpublish it from headers.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 0eeb0cb..ae21acb 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -812,8 +812,8 @@
 	return get_phy_device_by_mask(bus, phy_mask);
 }
 
-void phy_connect_dev(struct phy_device *phydev, struct udevice *dev,
-		     phy_interface_t interface)
+static void phy_connect_dev(struct phy_device *phydev, struct udevice *dev,
+			    phy_interface_t interface)
 {
 	/* Soft Reset the PHY */
 	phy_reset(phydev);