Switch to impulse VelocityTracker strategy

Switch from lsq2 to impulse strategy for VelocityTracker.

Bug: 69069303
Test: flings in SystemUI and Google Maps with 1 and 2 fingers on both
Pixel 2 and Pixel 2 XL devices.
VelocityTracker_test currently fails 8 pre-recorded flings on Pixel, and
will be updated after this change has soaked in dogfood. The flings will
need to be re-recorded. Currently, in all 8 instances the reported
velocity is more than 20% smaller in magnitude than expected velocity.
m -j inputflinger_tests_InputReader_test
inputflinger_tests_InputDispatcher_test libinput_tests_InputChannel_test
libinput_tests_InputEvent_test
libinput_tests_InputPublisherAndConsumer_test
libinput_tests_VelocityTracker_test && adb push
out/target/product/$TARGET_PRODUCT/data/nativetest64/*
/data/nativetest64/
Then run test binaries on the device.

Change-Id: I952fdfdc4ecd21cdfa50ec388af7f98d1b0d8cbe