usb gadget: don't save bind callback in struct usb_gadget_driver

To accomplish this the function to register a gadget driver takes the bind
function as a second argument.  To make things clearer rename the function
to resemble platform_driver_probe.

This fixes many section mismatches like

	WARNING: drivers/usb/gadget/g_printer.o(.data+0xc): Section mismatch in
	reference from the variable printer_driver to the function
	.init.text:printer_bind()
	The variable printer_driver references
	the function __init printer_bind()

All callers are fixed.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
[m.nazarewicz@samsung.com: added dbgp]
Signed-off-by: Michał Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c
index e743122..ed02664 100644
--- a/drivers/usb/gadget/imx_udc.c
+++ b/drivers/usb/gadget/imx_udc.c
@@ -1319,14 +1319,15 @@
  * USB gadged driver functions
  *******************************************************************************
  */
-int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
+		int (*bind)(struct usb_gadget *))
 {
 	struct imx_udc_struct *imx_usb = &controller;
 	int retval;
 
 	if (!driver
 		|| driver->speed < USB_SPEED_FULL
-		|| !driver->bind
+		|| !bind
 		|| !driver->disconnect
 		|| !driver->setup)
 			return -EINVAL;
@@ -1342,7 +1343,7 @@
 	retval = device_add(&imx_usb->gadget.dev);
 	if (retval)
 		goto fail;
-	retval = driver->bind(&imx_usb->gadget);
+	retval = bind(&imx_usb->gadget);
 	if (retval) {
 		D_ERR(imx_usb->dev, "<%s> bind to driver %s --> error %d\n",
 			__func__, driver->driver.name, retval);
@@ -1362,7 +1363,7 @@
 	imx_usb->gadget.dev.driver = NULL;
 	return retval;
 }
-EXPORT_SYMBOL(usb_gadget_register_driver);
+EXPORT_SYMBOL(usb_gadget_probe_driver);
 
 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 {