Fix huge bounce-back in ListView when double-flinging

The bounce-back reliably happened when AbsListView.fling
was called with high enough velocity (>50000). Such values
caused integer overflow when squared in the course of some
ballistic calculations in OverScroller.fitOnBounceCurve.

Bug: 19056278
Change-Id: I35d5376c67bc6847955b44ee268e89bce2db81d0