Update submodule ecl to latest Fri Aug 9 02:59:11 UTC 2019

    - ecl in PX4/Firmware (e93e676): PX4/PX4-ECL@d38164f
    - ecl current upstream: PX4/PX4-ECL@62fa464
    - Changes: PX4/PX4-ECL@d38164f...62fa464

    62fa464 2019-07-17 RomanBapst - WindEstimator: added support for pre-set airspeed scale factor
a7d9c73 2019-07-09 Silvan Fuhrer - Wind estimator: added wind_estimator_reset state (to indicate if wind estimator was reset in last fusion-cycle)
09f29db 2019-07-02 Silvan Fuhrer - added option to fix airspeed scaling to 1