Revert to lsq2 VelocityTracker strategy

The impulse implementation causes high velocity
at liftoff on some hardware. Reverting back to lsq2
for now.

Bug: 35412046
Fixes: 69069303
Test: use Google Maps with 2 fingers with both strategies
Change-Id: I7138fa12468303aa3885f4731bbdacbf5c7ce3a8