armv8: fsl-layerscape: rework the dwc3 snooping enable code
Instead of looking at all USB (host) devices, just search all DWC3 device tree nodes. This will (1) fix a panic if of_match is zero and (2) also apply the fixup if the controller is in peripheral mode. Both happen when the DWC3 USB controller driver is used. Signed-off-by: NMichael Walle <michael@walle.cc> Reviewed-by: NPriyanka Jain <priyanka.jain@nxp.com>
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