Align the scroll ballistics with the pointing ballistics.

The scroll ballistics function is much faster than pointing, which
will make the scrolling feel less controllable than pointing. We
therefore use the same ballistic curves for both pointing and
scroll to provide a consistent touchpad interaction experience.

Bug: 278172968
Test: manuallly
Change-Id: I28c7b597cd86aec4d72dbdf76e3f1078e9c2c706