Update submodule ecl to latest Sat Sep 26 15:30:31 UTC 2020
Update submodule ecl to latest Sat Sep 26 15:30:31 UTC 2020

    - ecl in PX4/Firmware (5784cb6e5eb74fcf07f3da058692c7c2320851b9): https://github.com/PX4/ecl/commit/fab242a81f3836de716b0ed96fcc841360c3a867
    - ecl current upstream: https://github.com/PX4/ecl/commit/6b99ea2a6038c536f92aaa2b7d24ce7962e55df6
    - Changes: https://github.com/PX4/ecl/compare/fab242a81f3836de716b0ed96fcc841360c3a867...6b99ea2a6038c536f92aaa2b7d24ce7962e55df6

    6b99ea2 2020-09-24 Daniel Agar - ECL standalone build improve ECL_INFO/WARN/DEBUG
5879eaa 2020-09-25 bresch - ekf: fix variable length array error
99aafba 2020-09-14 Daniel Agar - README: remove obsolete build status

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