Update submodule nuttx to latest Sun Dec 23 21:16:39 UTC 2018

- nuttx in PX4/Firmware (faf082fa1876b3f96ff9c07fc91ab8211d274c60): c225d4a691
    - nuttx current upstream: c225d4a691
    - Changes: c225d4a691...c225d4a691
This commit is contained in:
PX4 Build Bot
2018-12-23 21:16:40 +00:00
committed by Daniel Agar
parent 2790cace4f
commit 0636aff5d5