Update submodule nuttx to latest Sat Feb  8 12:38:09 UTC 2020
Update submodule nuttx to latest Sat Feb  8 12:38:09 UTC 2020

    - nuttx in PX4/Firmware (4b356c91f2be41dfdadb38270fab01ddb337d3c7): https://github.com/PX4/NuttX/commit/7b36108b548642f1a8513dcf00eb4913f8558ccf
    - nuttx current upstream: https://github.com/PX4/NuttX/commit/fdf1837077104e80912a2c46ff159fdacc8b06f9
    - Changes: https://github.com/PX4/NuttX/compare/7b36108b548642f1a8513dcf00eb4913f8558ccf...fdf1837077104e80912a2c46ff159fdacc8b06f9

    fdf1837077 2020-02-07 Peter van der Perk - [BACKPORT] S32K add support for Nxp drone boards (#224)
f479b26c98 2020-02-07 Peter van der Perk - [BACKPORT] imxrt added missing i2c prescale mask
26dd187034 2020-02-07 Peter van der Perk - [BACKPORT] Kinetis renamed TJA1100 to TJA110X registers

acfloria/Firmware,acfloria/Firmware,krbeverx/Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,PX4/Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,krbeverx/Firmware,PX4/Firmware,PX4/Firmware,PX4/Firmware