dm: usb: Adjust usb command to prepare for driver model
Use 'udev' instead of 'dev' in a few places, reserving 'dev' for driver model's struct udevice. Also adjust the code in a few minor ways to make it easier to plumb in driver model. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NMarek Vasut <marex@denx.de>
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