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1f6d9bbd17
Add usb_fs driver so that userspace can directly transfer USB packets through the EP node. ADB, Fastboot, MTP will use usb_fs, these class driver only need to provide the descriptors and register the usb_fs device. Signed-off-by: zhangyuan21 <zhangyuan21@xiaomi.com> Signed-off-by: zhangyuan21 <zhangyuan21@xiaomi.com>