phy: core: Let node ptr of PHY point to PHY and not of PHY provider

In case of multi-phy PHY providers, each PHY should be modeled as a sub
node of the PHY provider. Then each PHY will have a different node pointer
(node pointer of sub node) than that of PHY provider. Added this provision
in the PHY core.
Also fixed all drivers to use the updated API.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Lee Jones <lee.jones@linaro.org>

Documentation/phy.txt

@@ -53,10 +53,12 @@ unregister the PHY.
 The PHY driver should create the PHY in order for other peripheral controllers
 to make use of it. The PHY framework provides 2 APIs to create the PHY.
 
-struct phy *phy_create(struct device *dev, const struct phy_ops *ops,
-        struct phy_init_data *init_data);
-struct phy *devm_phy_create(struct device *dev, const struct phy_ops *ops,
-	struct phy_init_data *init_data);
+struct phy *phy_create(struct device *dev, struct device_node *node,
+		       const struct phy_ops *ops,
+		       struct phy_init_data *init_data);
+struct phy *devm_phy_create(struct device *dev, struct device_node *node,
+			    const struct phy_ops *ops,
+			    struct phy_init_data *init_data);
 
 The PHY drivers can use one of the above 2 APIs to create the PHY by passing
 the device pointer, phy ops and init_data.