USB: phy: drop unused legacy controller-phy bind helper

Drop the unused legacy usb_bind_phy() helper whose last user was removed
in 2016 when OMAP moved to device-tree boot (9080b8dc76 ("ARM: OMAP2+:
Remove legacy usb-host.c platform init code")).

Note that this means that for the last couple of years the phy_bind_list
has been empty (when using mainline kernels) and that consequently all
phy lookups using the usb_get_phy_dev() interface have failed with
-ENODEV. This helper along with its current users will be removed by
follow-on patches.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/usb/phy.h

@@ -242,8 +242,6 @@ extern struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
 	struct device_node *node, struct notifier_block *nb);
 extern void usb_put_phy(struct usb_phy *);
 extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
-extern int usb_bind_phy(const char *dev_name, u8 index,
-				const char *phy_dev_name);
 extern void usb_phy_set_event(struct usb_phy *x, unsigned long event);
 extern void usb_phy_set_charger_current(struct usb_phy *usb_phy,
 					unsigned int mA);
@@ -293,12 +291,6 @@ static inline void devm_usb_put_phy(struct device *dev, struct usb_phy *x)
 {
 }
 
-static inline int usb_bind_phy(const char *dev_name, u8 index,
-				const char *phy_dev_name)
-{
-	return -EOPNOTSUPP;
-}
-
 static inline void usb_phy_set_event(struct usb_phy *x, unsigned long event)
 {
 }