drivers: udc_dwc2: Recover after STALLed OUT Data Stage

Prepare buffer to receive SETUP data on OUT endpoint 0 after endpoint
halt. This solves the issue where the device would no longer process any
control transfers after the first failed transfer with too large OUT
Data Stage (when processing failed due to data stage buffer allocation
failure).

Signed-off-by: Tomasz Moń <tomasz.mon@nordicsemi.no>