FMUv2: fixed UART3 flow control pins
FMUv2: fixed UART3 flow control pins

PX4/Firmware,jlecoeur/Firmware,dagar/Firmware,PX4/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,dagar/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,krbeverx/Firmware,darknight-007/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,PX4/Firmware,darknight-007/Firmware,dagar/Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,PX4/Firmware,jlecoeur/Firmware,dagar/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,darknight-007/Firmware,PX4/Firmware,jlecoeur/Firmware,darknight-007/Firmware,acfloria/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,Aerotenna/Firmware,PX4/Firmware,jlecoeur/Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,darknight-007/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware