usb: gadget: function: Remove unused declarations
These declarations are not implemented anymore, remove them. Signed-off-by: Yue Haibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20230818124025.51576-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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