It's not needed after [1] is applied, because usb_debug_root is created
by usb common core but not usbcore now.
[1] 812086d362
("USB: move usb debugfs directory creation to the usb common core")
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>