usb: gadget: export composite's setup & disconnect function
The configfs can't use all of composite's hooks because ->bind() and ->unbind() has to be done a little differently. ->disconnect() and ->setup() on the hand can be recycled. This patch exports them both so configfs can use them. Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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