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>
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index 7a4ea55..61ebea4 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -295,7 +295,7 @@
 				return PTR_ERR(phy->pmu);
 		}
 
-		phy->phy = devm_phy_create(dev, &sun4i_usb_phy_ops, NULL);
+		phy->phy = devm_phy_create(dev, NULL, &sun4i_usb_phy_ops, NULL);
 		if (IS_ERR(phy->phy)) {
 			dev_err(dev, "failed to create PHY %d\n", i);
 			return PTR_ERR(phy->phy);