drivers/usb/gadget/udc: Fix spelling typo in comments(reqest->request)

Fix spelling typo in comments.

Reported-by: k2ci <kernel-bot@kylinos.cn>
Signed-off-by: liyouhong <liyouhong@kylinos.cn>

Link: https://lore.kernel.org/r/20231221023425.1316397-1-liyouhong@kylinos.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>