net: phy: Remove static return type for phy_device_create()

Remove static return type for phy_device_create() to avoid file scope for
this function. Also add required prototype in phy.h.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Link: https://lore.kernel.org/r/1517f4053403fbd53e899d500e7485d068a4f0b6.1645627539.git.michal.simek@xilinx.com
diff --git a/include/phy.h b/include/phy.h
index c66fd43..832d7a1 100644
--- a/include/phy.h
+++ b/include/phy.h
@@ -454,6 +454,19 @@
 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 				struct udevice *dev,
 				phy_interface_t interface);
+/**
+ * phy_device_create() - Create a PHY device
+ *
+ * @bus:		MII/MDIO bus that hosts the PHY
+ * @addr:		PHY address on MDIO bus
+ * @phy_id:		where to store the ID retrieved
+ * @is_c45:		Device Identifiers if is_c45
+ * @interface:		interface between the MAC and PHY
+ * @return: pointer to phy_device if a PHY is found, or NULL otherwise
+ */
+struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
+				     u32 phy_id, bool is_c45,
+				     phy_interface_t interface);
 
 static inline ofnode phy_get_ofnode(struct phy_device *phydev)
 {