drivers: udc_dwc2: Support High-Bandwidth endpoints

Make driver aware of High-Bandwidth endpoints both in Completer and
Buffer DMA mode. In Completer mode TxFIFO must be able to hold all
packets for microframe, while in Buffer DMA mode space enough for two
packets is sufficient.

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