usb: dwc2: Add support to get usb speed from dtb
This change will get "maximum-speed" from dtb if exist and set USB speed accordingly for Agilex and Stratix10 platform. Signed-off-by: Liwei Song <liwei.song@windriver.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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079d79a4
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