Update submodule ecl to latest Fri Jun  5 00:39:52 UTC 2020
Update submodule ecl to latest Fri Jun  5 00:39:52 UTC 2020

    - ecl in PX4/Firmware (d4fcf77c546c31c4c0b813e5034c66581b3b2877): https://github.com/PX4/ecl/commit/c91c78dcf67dee85225ada6621b6fd19ec008fd5
    - ecl current upstream: https://github.com/PX4/ecl/commit/b3dc06d0cb572931000705ac04807eeae5e2401a
    - Changes: https://github.com/PX4/ecl/compare/c91c78dcf67dee85225ada6621b6fd19ec008fd5...b3dc06d0cb572931000705ac04807eeae5e2401a

    b3dc06d 2020-05-25 Roman Bapst - Added height above ground source bitmask indicating which sensor is used
62e15cb 2020-06-03 bresch - sensor_simulator: set IMU rate to 200Hz as this is the new value used in the Firmware
6126c19 2020-06-03 bresch - sensor_simulator: update EKF at IMU rate
59183f7 2020-06-02 Paul Riseborough - EKF: Reduce EKF-GSF vulnerability to large yaw gyro bias errors (#831)
d0ddda8 2020-05-29 Matthias Grob - tecs: fix typo init(i)alized
86fc94b 2020-05-24 Kamil Ritz - Remove tilt align from position innovation check
b024cdd 2020-05-25 Mathieu Bresciani - unit test: check that the accel bias is only learned when observable (#827)

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