imx: mx6slevk: cleanup board usb code
Since DM_USB enabled, no need the usb code in board file. Signed-off-by: NPeng Fan <peng.fan@nxp.com> Cc: Stefano Babic <sbabic@denx.de> Cc: Fabio Estevam <fabio.estevam@nxp.com> Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
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