px4fmu-v4: Only close down fmu drivers on reset if they weren't running
px4fmu-v4: Only close down fmu drivers on reset if they weren't running

Signed-off-by: zthorson <0ea45e1b3a6c23cdab2616349566c9b4e723fa9a@gmail.com>

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