board: sl28: switch to dwc3 driver

Now that the DWC3 USB driver has support for the layerscape platform,
use it. This will have the benefit that peripheral mode will work.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed