tap-v1 NuttX defconfig: lower CONFIG_DEV_PIPE_SIZE to 70
tap-v1 NuttX defconfig: lower CONFIG_DEV_PIPE_SIZE to 70

This saves almost 2kb of RAM when using the mavlink shell. 70 matches the
size of the mavlink message. Since the pipe is blocking, a process writing
a lot of data will just wait, data will not be dropped.

The mavlink shell is the only process creating a pipe.

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