usb: host: ohci: change trace level for phy errors managed by uclass

As the error message is now displayed by generic phy functions,
the dev_err can be change to dev_dbg.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/usb/host/ohci-generic.c b/drivers/usb/host/ohci-generic.c
index b84bf8a..ed5e500 100644
--- a/drivers/usb/host/ohci-generic.c
+++ b/drivers/usb/host/ohci-generic.c
@@ -41,13 +41,13 @@
 	} else {
 		ret = generic_phy_init(&priv->phy);
 		if (ret) {
-			dev_err(dev, "failed to init usb phy\n");
+			dev_dbg(dev, "failed to init usb phy\n");
 			return ret;
 		}
 
 		ret = generic_phy_power_on(&priv->phy);
 		if (ret) {
-			dev_err(dev, "failed to power on usb phy\n");
+			dev_dbg(dev, "failed to power on usb phy\n");
 			return generic_phy_exit(&priv->phy);
 		}
 	}
@@ -63,13 +63,13 @@
 	if (generic_phy_valid(&priv->phy)) {
 		ret = generic_phy_power_off(&priv->phy);
 		if (ret) {
-			dev_err(dev, "failed to power off usb phy\n");
+			dev_dbg(dev, "failed to power off usb phy\n");
 			return ret;
 		}
 
 		ret = generic_phy_exit(&priv->phy);
 		if (ret) {
-			dev_err(dev, "failed to power off usb phy\n");
+			dev_dbg(dev, "failed to power off usb phy\n");
 			return ret;
 		}
 	}