usb: use kobj_to_dev() API

Use kobj_to_dev() API instead of container_of().

Signed-off-by: chenqiwu <chenqiwu@xiaomi.com>
Link: https://lore.kernel.org/r/1581683820-9978-1-git-send-email-qiwuchen55@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>