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>

drivers/phy/phy-exynos-dp-video.c

@@ -77,7 +77,7 @@ static int exynos_dp_video_phy_probe(struct platform_device *pdev)
 	if (IS_ERR(state->regs))
 		return PTR_ERR(state->regs);
 
-	phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL);
+	phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops, NULL);
 	if (IS_ERR(phy)) {
 		dev_err(dev, "failed to create Display Port PHY\n");
 		return PTR_ERR(phy);