tfmini: use px4_open/read and default range finder device path
tfmini: use px4_open/read and default range finder device path

this is more consistant and should enable it on qurt/linux

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