usb: mtu3: set invalid dr_mode as dual-role mode
Treat dr_mode of USB_DR_MODE_UNKNOWN as USB_DR_MODE_OTG to enhance functional robustness. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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