This PR adds a new enum_ports call to the serial driver's control API that lets user-mode programs list the serial ports currently registered in the system. It also updates debug output strings, changes the USB FTDI driver's service procedure name, and removes duplicated code from the baud rate calculation. Reviewed-on: KolibriOS/kolibrios#629 Reviewed-by: Mikhail Frolov <mixa.frolov2003@gmail.com> Reviewed-by: Burer <burer@kolibrios.org> Co-authored-by: Alexey Ryabov <alex@b00bl1k.ru>