usb: gadget: f_mass_storage: remove deprecated fsg_add()

There are no in-tree fsg_add() users and it has been deprecated
since 2.6.35 [1dc90985: fsg_add() renamed to fsg_bind_config()] so
out-of-tree users had more then enough time to convert.  Removing.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/f_mass_storage.c

@@ -3110,13 +3110,6 @@ static int fsg_bind_config(struct usb_composite_dev *cdev,
 	return rc;
 }
 
-static inline int __deprecated __maybe_unused
-fsg_add(struct usb_composite_dev *cdev, struct usb_configuration *c,
-	struct fsg_common *common)
-{
-	return fsg_bind_config(cdev, c, common);
-}
-
 
 /************************* Module parameters *************************/