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The STM32F3 requires a dedicated digital signal to emulate a disconnect event by pulling D+ down via a 1.5 kOhm resistor. Some boards, such as the OLIMEXINO-STM32F3, do not directly connect a GPIO but place a transistor in between. Depending on the exact implementation, the logic level may end up being inverted compared to directly connecting a GPIO. This adds a flag member to the `stm32_usbdev_fs_config_t` and a new flag to indicate inverted logic. In addition the members in the struct are sorted by alignment, as this is a foolproof algorithm to prevent wasting memory on unneeded padding. Finally, the USB driver is adapted to honor the flag. Co-authored-by: crasbe <crasbe@gmail.com>