px4fmu-v3 nuttx config: reduce CONFIG_CDCACM_TXBUFSIZE to 2000
px4fmu-v3 nuttx config: reduce CONFIG_CDCACM_TXBUFSIZE to 2000

Log file download via Mavlink is the one that needs the most bandwidth.
It needs typically around 200B TX buffer, and spikes at around 1500B every
10sec, with an average download speed of 230KB/s.

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