Instead of calling the eagle cmake script from excelsior, use a shared
sdflight cmake file like in it is done for the POSIX build on
Snapdragon.

-can't sync after deinit

Instead of calculating time offsets between samples, it is easier just
to assume a constant sampling time. Then all samples can be integrated,
and published every forth time the FIFO buffer has been emptied.

The sampling in the sensor happens at 8kHz, the driver empties the
buffer at 1kHz, and publishes (and resets the integration) at 250 Hz.

This adds a second put method to the integrator class. This allows to
integrate with known intervals between samples, rather than based on
timestamps. This makes integrating the samples coming out of the MPU9250
FIFO buffer easier.

if fuseOptFlowData == false, then K_LOS was not initialized, but it was
accessed in the next fuse block to update states variable.

This fixes a memory leak