QNX: Enable custom baud rate
QNX: Enable custom baud rate

Change-Id: Iec4124886514c5bdeae1cf00e3b2e9432a2c75ee
Reviewed-by: Sergey Belyashov <8871b4c2d635fca691211507eadbac3d0bc2695a@gmail.com>

RoadWorksSoftware/QtSerialPort-OS2,RoadWorksSoftware/QtSerialPort-OS2