dwc_otg: add handling of SPLIT transaction data toggle errors
Previously a data toggle error on packets from a USB1.1 device behind a TT would result in the Pi locking up as the driver never handled the associated interrupt. Patch adds basic retry mechanism and interrupt acknowledgement to cater for either a chance toggle error or for devices that have a broken initial toggle state (FT8U232/FT232BM).
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34b69827
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