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The i.MX8M Mini has two available USB controllers.  On the
imx8mm-beacon board, USB1 is routed to a mini-USB port with
OTG functionality.  USB2 is routed to a USB hub which has
three host-only ports connected to it.
Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>