CC: mvebu: kirkwood: fix ehci-orion probe if generic-phy isn't enabled

Properly treat -ENOSYS as no PHY, else ehci-orion won't work without
generic phy support.

Backport of r46711.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46712 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic/patches-3.18/191-usb-ehci-orion-fix-probe-for-GENERIC_PHY.patch

@@ -0,0 +1,35 @@
+From a95f03e51471dbdbafd3391991d867ac2358ed02 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sun, 23 Aug 2015 14:23:29 +0200
+Subject: [PATCH] usb: ehci-orion: fix probe for !GENERIC_PHY
+
+Commit d445913ce0ab7f ("usb: ehci-orion: add optional PHY support")
+added support for optional phys, but devm_phy_optional_get returns
+-ENOSYS if GENERIC_PHY is not enabled.
+
+This causes probe failures, even when there are no phys specified:
+
+[    1.443365] orion-ehci f1058000.usb: init f1058000.usb fail, -38
+[    1.449403] orion-ehci: probe of f1058000.usb failed with error -38
+
+Similar to dwc3, treat -ENOSYS as no phy.
+
+Fixes: d445913ce0ab7f ("usb: ehci-orion: add optional PHY support")
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ drivers/usb/host/ehci-orion.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/drivers/usb/host/ehci-orion.c
++++ b/drivers/usb/host/ehci-orion.c
+@@ -226,7 +226,8 @@ static int ehci_orion_drv_probe(struct p
+ 	priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
+ 	if (IS_ERR(priv->phy)) {
+ 		err = PTR_ERR(priv->phy);
+-		goto err_phy_get;
++		if (err != -ENOSYS)
++			goto err_phy_get;
+ 	} else {
+ 		err = phy_init(priv->phy);
+ 		if (err)