Get velocitytracker strategy from InputManager

We are already caching this value inside InputManager, so let's just use
it directly from there.

We can't get this value reliably from ViewConfiguration because we dont
have a UI context. We can't use the application context because it would
create strict mode violations.

Bug: 233112584
Test: atest BinderTests#testSwitchToOverview
Test: atest android.view.cts.VelocityTrackerTest
Change-Id: I86595fb133c298b5dd1098b58b8743bb16a2e24b