Update submodule ecl to latest Wed Feb  5 12:39:46 UTC 2020
Update submodule ecl to latest Wed Feb  5 12:39:46 UTC 2020

    - ecl in PX4/Firmware (ad3865207f22e26534e04cde8825a07eda4399b5): https://github.com/PX4/ecl/commit/a3e1eb9d509d55c2c476ec093cf24d84da9798e5
    - ecl current upstream: https://github.com/PX4/ecl/commit/ed260c4f1db8545d8ad3aa7f05d951857436ef87
    - Changes: https://github.com/PX4/ecl/compare/a3e1eb9d509d55c2c476ec093cf24d84da9798e5...ed260c4f1db8545d8ad3aa7f05d951857436ef87

ed260c4 2020-02-03 Daniel Agar - validation: remove unused vibration metric
e52e2b8 2020-02-01 kritz - Sensor Replay (#717)
da752c9 2020-01-28 kamilritz - Hot flow fusion fix
ee859e0 2020-01-28 kritz - Robustify timestamp checks (#729)
f20726d 2020-01-23 kamilritz - Expand auto-format coverage and tiny style changes
fbdd75d 2020-01-27 kritz - Update CONTRIBUTING.md
5d38b73 2020-01-24 kamilritz - Update description of Firmware build tests
e3af91c 2020-01-24 bresch - Ekf: use helper functions to centralize the checks of horizontal aiding (gps, flow, ev_pos, ev_vel)
PX4/Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,PX4/Firmware,PX4/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,PX4/Firmware,acfloria/Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,acfloria/Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,acfloria/Firmware