Update submodule nuttx to latest Sat Apr 25 12:38:14 UTC 2020
Update submodule nuttx to latest Sat Apr 25 12:38:14 UTC 2020

    - nuttx in PX4/Firmware (2c938af28051250f90baf7c411179b9b01dc5d0c): https://github.com/PX4/NuttX/commit/7fffab1610d2ea08a95383febd0579e0037b6b51
    - nuttx current upstream: https://github.com/PX4/NuttX/commit/66b4f2c4f2128994f8e8a908d4888f6d37565cfd
    - Changes: https://github.com/PX4/NuttX/compare/7fffab1610d2ea08a95383febd0579e0037b6b51...66b4f2c4f2128994f8e8a908d4888f6d37565cfd

    66b4f2c4f2 2020-04-21 Peter van der Perk - [Backport] Added S32K1XX progmem driver to use the FlexNVM memory
1b3fc1c668 2020-04-10 Peter van der Perk - Added net_trylock so we can call can_input while being in a interrupt handler

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