Use `DWC2_USB_OTG_FS_TOTAL_FIFO_SIZE` instead of `USB_OTG_FS_TOTAL_FIFO_SIZE` since the latter is only defined in the vendor headers for STM32 MCUs. The STM32-specific problem that `USB_OTG_FS_TOTAL_FIFO_SIZE` is not defined in the vendor headers for all STM32 families has therefore been moved from the driver to the STM32-specific USB device header.
When using DMA to transfer endpoint data from the RX FIFO to the
endpoint memory, the RXFLVL irq is not needed as that is already handled
by the DMA. Furthermore, servicing this irq anyway can cause the event
handling to interpret data from the FIFO as the endpoint and status
marker during the DMA transfer.
This commit masks the RXFLVL irq while DMA is used for the endpoint
transfers.
The existence of the macros USB_OTG_GUSBCFG_ULPI_UTMI_SEL, USB_OTG_GUSBCFG_PHYIF and USB_OTG_GUSBCFG_DDRSEL depends on a specific STM32 line and not on STM32 itself. Therefore, the settings are made when the macros are defined.
